Rotary Tool Bits & Accessories: The Complete Buyer's Guide
The bit is where the work happens. This guide explains shank sizes, the main bit families, and how to pick an accessory kit that actually covers your projects.
1. Shank Sizes Explained
2. The 6-Bit Families
3. How to Choose
4. Hardell Accessory Kits
5. Bit Care & Safety
6. FAQ
1. Shank Sizes Explained
The shank is the part that goes into the collet. Sizes you will see:
| Shank | Common on | Note |
|---|---|---|
| 1/8" (3.175mm) | Most consumer rotary tools | Standard for Hardell tools |
| 3/32" (2.38mm) | Some slim tools | Needs a smaller collet |
| 1/16" (1.59mm) | Precision/jewelry work | Specialty bits |
Always match the bit shank to your collet. Forcing a wrong size damages the collet and causes dangerous wobble.
2. The 6-Bit Families
Cutting & Discs
Cut-off wheels slice metal, plastic, and wood trim. Diamond discs cut tile and glass. Use for trimming bolts, slots, and thin materials.
Grinding & Stones
Aluminum oxide and silicon carbide stones reshape metal, sharpen blades, and remove rust. Shapes: cone, cylinder, ball.
Sanding
Drums and bands (60–400 grit) smooth wood, plastic, and metal. Sanding discs fit backing pads for flat surfaces.
Polishing
Felt wheels, cotton buffs, and compound wheels bring metal and resin to a mirror shine.
Engraving & Carving
Carbide and diamond burrs carve wood, stone, glass, and metal. Ball, cylinder, and flame shapes cover most detail work.
Cleaning & Brushing
Wire brushes (steel/brass/nylon) strip paint, corrosion, and grout without damaging the base material.
3. How to Choose
- List your projects. Carving needs burrs; polishing needs felt wheels; cutting needs discs.
- Start with a large kit. A 150+ piece set costs less per bit than buying individually.
- Check material compatibility. Diamond for glass/stone, carbide for wood/metal, felt for polish.
- Keep spares of wear items. Cut-off wheels and sanding bands break down fast.
4. Hardell Accessory Kits
| Kit | Best for | Link |
|---|---|---|
| 230-piece kit | General DIY, cutting, sanding, polish | Most versatile |
| 282-piece kit | Heavy carving, grinding, detail | Max coverage |
5. Bit Care & Safety
- Discard cracked or chipped bits immediately.
- Clean resin and metal buildup with a brass brush.
- Store bits in the organized case so shanks stay straight.
- Wear eye protection — broken bits travel fast.
6. FAQ
What shank size do rotary tool bits use?
Most consumer rotary tools use a 1/8 inch (3.175mm) shank. Always match the bit shank to your collet.
Are brand bits interchangeable?
Yes, as long as the shank diameter matches your collet. Sticking to matched kits reduces vibration and fit issues.
How many accessories do I really need?
A 150–280 piece kit covers nearly every home task. Start with a large kit, then buy specialty bits as needed.
Which bits wear out fastest?
Cut-off wheels and sanding bands wear fastest. Keep spares of these in your kit.
Can I use a drill bit in a rotary tool?
Only purpose-made rotary tool drill bits with a 1/8-inch shank. Standard twist drills are too long and unbalanced.
Related: Browse all Hardell rotary tools →
