Accepts accessory rotary bits with 1/32-inch(0.8mm) to 1/8-inch(3.2mm) shanks Quick change chucks Only fit for Dremel rotary tools,NOT fit for other rotary tools Easy and quick to change accessories replacement on Dremel multi tool without changing collets Please note:Only suitable for Dremel rotary tool models 275,285,398;Also suitable for models 750,770 and 781 Use with rotary tool models 4000,400,3000,398,300,285,275,200,100,8220,8200,800,780,770,7700,750 Colour:Black Material:Carbide Size:22.6*14*9.3mm Package Contents: 2pcs * Electric grinder chuck Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.