ITEM NAME:2Pcs Collet Chuck Adapter Air Die Grinder Collect Machinery Woodworking Cutters Description: Chuck size: 6mm, 3mm, for 3mm and 6mm standard grinding bits. High quality car.2 Pieces of Air Die Grinder Collect. QuantityL 1pc 3mm, 1pc 6mm, 2Pcs in total. Chuck size: 6mm, 3mm, for 3mm and 6mm standard grinding bits. Collect chuck: 3mm and 6mm. Suitable for all kinds of grinding machine clamping grinding head.