The Evolution Zinc Coated Tek 5 Hex Head Screw is designed for fastening where a high end corrosion resistant coating is not required. Made from carbon steel and AISI C1022 material grade, with a Zinc coating and an effective thread length of 33.0mm. Fine thread form, a drilling capacity of 4.0-12.5mm and a recommended drill speed of 1500-2500 RPM.