Description Made of carbon steel, which offers outstanding impact resistant, the solid construction is designed to against dust, corrosion. Fine workmanship and creative appearance ensure its popularity and practicality. They can be used for fixing on the bit, limit the depth of the drill holes. Features -Color:Black-Material:Carbon steel-Size:1.50X1.30X1.00cm/0.59X0.51X0.39in-Diameter Specification:φ3mm, φ4mm, φ5mm, φ6mm, φ8mm, φ10mm, φ12mmφ16 mm-It is mainly used to fix the drill bit to limit the drilling depth of the drill bit, and it is more convenient to use the round dowel.-Adopts precision production to improve the stable characteristics and high reliability.-Made of carbon steel, which has better corrosion resistance and rust resistance, fine workmanship and durability.-Solve the problem of your repeated deep drilling or drilling too deep, improve your work effectively.-When fixed on the drill, it will not shifts, help you drill holes quickly and easily to a consistent, precise depth.Packing list: 8 x drill stop collars1 x wrenchPacking list: 8 x drill stop collars1 x wrench