Proxxon - MICROMOT steel collet set HOBBY TOOL, ARTS AND CRAFTS, MINIATURE MODEL BUILDING, PROXXO...

MICROMOT steel collets are hardened and thus have a high, consistent flexibility. They also maintain prolonged accuracy, even after regular use (these collets should not be compared with unhardened, fourslit collets of brass and aluminium).
The triple slit collet is substantially more difficult to manufacture than the four-slit type, but offers a better load-bearing surface.
This is especially important for cutters with small shaft diameters.
1 each of 1.0 - 1.5 - 2.0 - 2.4 - 3.0 and 3.2mm.
With clamping nut and holder for storage.