Famag Depth Adjusting collars Ø 5 mm 10 pcs in plastic tube Key Features: Inner diameter 5mm Clamp collar to be mounted on drill bits, with lateral attachment screw For fixing on drill bits to adjust the drilling depth If you don't need 10 pcs of one size, we recommend product line 2108.505 and 2108.507 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