A starting point for 2 exact models.
Confirm which collet is actually installed. Some references describe an optional collet sold separately. 1/4 inch and 6 mm shanks are different sizes.
Each row preserves the manufacturer’s field label. An optional or compatible collet is not a statement that it comes fitted to the tool.
Which models list this size?
Open your model for all specifications and any documented replacement part numbers.
| Exact model | Published size or fitting | Manufacturer evidence |
|---|---|---|
| Bosch Professional GOF 1600 CESizes & buying checks → | Supplied UK collets1/4 inch and 1/2 inch | Source ↗Checked 2026-10-03 |
| DeWalt DWE625KT-GBSizes & buying checks → | Supplied UK collet1/2 inch | Source ↗Checked 2026-10-03 |
What else needs to match?
Bosch Professional GOF 1600 CE: buying checks
Choose the cutter shank to match one of the two separate installed collets. The listed sizes do not describe an adjustable range.
- Match the cutter shank exactly to the approved collet actually installed; 6 mm is not 1/4 inch and 12 mm is not 1/2 inch.
- Check maximum cutter diameter, insertion depth and the chosen base in the tool manual.
- Keep the selected tool speed within the cutter’s rating and follow the maker’s material and feed guidance.
DeWalt DWE625KT-GB: buying checks
Use the UK 1/2 inch collet specification and the manual’s cutter limits. A 12 mm cutter requires its own approved matching collet.
- Confirm a 1/2 inch collet is installed and match the cutter shank exactly.
- Keep cutters within the documented 50 mm maximum cutting diameter and any operation-specific limits.
- Choose a cutter speed rating and working speed appropriate to its diameter, material and the manual.