Explore Every 7/8-inch TC Grade in Dedeco's Knife-Edge Disc Profile
Dedeco Sunburst 7/8″ TC Knife-Edge radial bristle discs use a tapered working profile to concentrate contact within grooves, channels, settings and other restricted areas.
This 43-piece assortment contains six Knife-Edge discs in each of the seven available grades, together with one mandrel with a 2.35mm (3/32″) shank. It provides enough of every grade to compare cutting action, establish a finishing sequence and continue working with the most suitable options.
Knife-Edge describes the tapered disc geometry. Each disc is 3.2mm (1/8″) thick at its widest point and narrows towards the working edge. Flexible, curved TC bristles help the disc follow detailed contours while limiting contact with adjacent surfaces.
Need to replenish a particular grade? Individual 7/8″ TC Knife-Edge discs are available separately.
View Individual 7/8-inch TC Knife-Edge DiscsWhy Choose the Knife-Edge Disc Assortment?
Compare Every Grade
Trial the complete progression from coarse 80 grit through to ultra-fine 1 micron to identify a suitable starting point and finishing sequence.
Precision Knife-Edge Profile
The tapered working edge concentrates contact within grooves, settings, channels and detailed features that are difficult to reach with a broader disc profile.
Six Discs per Grade
Useful quantities of every grade support initial comparison, process development and continued work after the preferred sequence has been established.
Knife-Edge or Standard-Profile Loose Disc Assortment?
Choose the Knife-Edge assortment when a tapered working edge is needed for grooves, prongs, settings, channels and other restricted or recessed areas.
Choose the 86-piece standard-profile assortment for a thinner, flatter working face suited to general cleaning, blending and polishing. Its discs can be used individually or combined in matching stacks, with 12 discs per grade and both 2.35mm and 3.18mm shank mandrels included.
Typical Applications
- Comparing the complete Knife-Edge disc grade range
- Cleaning and finishing grooves, slots and narrow channels
- Working around prongs, settings and intricate jewellery features
- Controlled deburring of restricted edges and internal profiles
- Removing localised oxidation and light surface contamination
- Refining cast jewellery, dental work and precision components
- Blending and smoothing detailed or recessed areas
- Progressing from initial cleaning through to fine polishing in difficult-to-reach areas
Suitable Materials
These discs can be used across suitable precious and non-ferrous metals, steel, stainless steel, cast iron, aluminium, brass and bronze. They are also suitable for selected wood, acrylic, plastic and ceramic applications.
Always test the selected grade on an inconspicuous area first, particularly on softer, coated or heat-sensitive materials.
Assortment Contents & Grades
What's Included
- 42 Knife-Edge radial discs: Six discs in each of seven colour-coded grades
- One screw-top mandrel: For fitting the included 1.6mm centre-hole discs
- Mandrel shank: 2.35mm (3/32″) for compatible handpieces, micromotors, flexible shaft machines and rotary tools
- Total pack quantity: 43 pieces
Confirm that the 2.35mm mandrel shank exactly matches the chuck or collet fitted to your machine or handpiece.
Grade Selection
The assortment covers the following seven grades. Begin with the finest grade capable of producing the required result.
| Colour | Grade | Quantity | Typical Use |
|---|---|---|---|
| Yellow (Coarse) |
80 Grit (Aluminium Oxide) |
6 x Knife-Edge discs | Heavy localised cleaning, deburring and initial surface conditioning |
| White (Medium) |
120 Grit (Aluminium Oxide) |
6 x Knife-Edge discs | Controlled deburring and smoothing within grooves and detailed features |
| Red (Standard) |
220 Grit (Aluminium Oxide) |
6 x Knife-Edge discs | Targeted blending, scratch refinement and preparation for finer finishing |
| Blue (Fine) |
400 Grit (Aluminium Oxide) |
6 x Knife-Edge discs | Fine finishing and smoothing along narrow or recessed features |
| Pink (Pumice) |
600 Grit (Pumice) |
6 x Knife-Edge discs | Pre-polishing within settings, channels and detailed areas |
| Peach (Extra-Fine) |
6 Micron (Aluminium Oxide) |
6 x Knife-Edge discs | Fine polishing and development of an initial lustre |
| Light Green (Ultra-Fine) |
1 Micron (Aluminium Oxide) |
6 x Knife-Edge discs | Final high-lustre finishing in intricate or restricted areas |
Using the Knife-Edge Profile
The tapered disc profile concentrates abrasive contact towards its narrow outer edge.
- Fit one Knife-Edge disc securely to the supplied mandrel
- Present the tapered working edge to the feature being finished
- Install the disc in its marked direction of rotation
- Ensure that the screw-top mandrel remains fully engaged
Stacking for Bespoke Tasks
For most applications, use a single disc to retain the narrow, tapered Knife-Edge profile. This provides controlled access to grooves, channels, prongs, settings and other restricted areas while limiting contact with adjacent surfaces.
Multiple matching discs can be stacked for highly bespoke tasks where a wider or more supported working edge is required. When stacking:
- Only combine discs of the same diameter, profile and grade
- Fit every disc facing the same direction
- Do not exceed the secure capacity of the mandrel
- Ensure the retaining screw is fully engaged before use
Operating & Safety Guidance
- Recommended operating range: 3,000–18,000 RPM
- Woodworking reference speed: Approximately 5,000 RPM
- Never exceed the lowest maximum speed stated for the disc, mandrel or machine
- Confirm that the 2.35mm mandrel shank matches the machine or collet
- Install every disc so the tail of each curved bristle follows the direction of rotation
- Use the tapered bristle edge with light pressure rather than forcing it into the workpiece
- Keep the tool moving to control localised heat and uneven wear
- Check that the screw-top mandrel is secure before starting the machine
- Use suitable machine guarding and appropriate personal protective equipment
Product Specifications
| Product range | Dedeco Sunburst |
|---|---|
| Nominal diameter | 7/8″ (22mm) |
| Disc type | Knife-Edge radial bristle disc |
| Profile | Tapered to a narrow precision working edge |
| Bristle profile | TC curved and conformable bristles (Type C) |
| Bristle characteristics | Flexible and single-directional |
| Individual disc thickness | 1/8″ (3.2mm), tapered towards the working edge |
| Centre hole | 1/16″ (1.6mm) |
| Abrasive grain | Aluminium oxide; 600 grit uses pumice |
| Included grades | 80, 120, 220, 400 and 600 grit, plus 6 micron and 1 micron |
| Supply format | Loose Knife-Edge disc assortment kit |
| Pack contents | 42 discs and one mandrel – 43 pieces in total |
| Discs per grade | Six |
| Included mandrel | One screw-top mandrel |
| Mandrel shank | 2.35mm (3/32″) |
| Recommended operating range | 3,000–18,000 RPM |
| Woodworking reference speed | Approximately 5,000 RPM |
| Suitable equipment | Micromotors, flexible shaft machines, jewellery handpieces and compatible rotary tools with a 2.35mm collet or chuck |
| Polishing compound required | No |
Complete Your Radial Finishing Setup
Reorder Knife-Edge Discs
Replenish the individual Knife-Edge grades used most frequently after testing the assortment.
Abrasive Wheels
7/8″ (22mm) Dedeco Sunburst TC Radial Bristle Discs – Knife-Edge
Prefer a Standard Profile?
Choose standard TC discs for broader general finishing and the flexibility to configure custom stacks.
Abrasives for Power Tools
7/8″ (22mm) Dedeco Sunburst TC Standard-Profile Radial Discs – Loose Discs & 4-Ply Sets with Mandrel
Need Faster Cutting?
Choose Dual discs for a wider, more stable working face and more aggressive first-stage cutting.
Abrasives for Power Tools