Famag Depth Adjusting collar Set of 7 pcs 3-12 mm in plastic tube Ref: 2108.507 Key Features: Ø 3, 4, 5, 6, 8, 10, 12 mm Clamp collar to be mounted on drill bits, with lateral attachment screw For fixing on drill bits to adjust the drilling depth UPM: 3 and 4 mm drill bits with assembled ring should be used with lower rpm than the recommended speed for the single drill bit