ITEM NAME:Die Grinder Collet Chuck Machinery Manufacturing Woodworking Cutter 3mm Description: Chuck size: 6mm, 3mm, for 3mm and 6mm standard grinding bits. High quality car.1 Piece Air Die Grinder Collect. Chuck size: 6mm, 3mm, for 3mm and 6mm standard grinding bits. Collect chuck: 3mm/ 6mm. High precise clamping force, good grip stability. Due to the different monitor and light effect, the actual color may be slightly different from the picture color.