This Evolution Hex Head Halter Clip Tek 2 Screw is designed for fixing halter brackets, with a 16mm Bonded EPDM Washer. It has a coarse thread form (Tek 2) and is made from carbon steel with a AISI C1022 material grade. The drilling capacity is 0.8-2.5mm and the recommended drill speed is 1500-2500 RPM.