ITEM NAME:Air Alloy Grinder Collet Chuck For Air Grinder Grinding Machine Polishing 6mm Description: Chuck size: 6mm, 3mm, for 3mm and 6mm standard grinding bits. High quality car.Suitable for all kinds of grinding machine clamping grinding head. Chuck size: 6mm, 3mm, for 3mm and 6mm standard grinding bits. 1 Piece Air Die Grinder Collect. Collect chuck: 3mm/ 6mm. High precise clamping force, good grip stability.