The Evolution Double Countersunk Head Self-Drilling Spoon Point Cementitious Board Screw is designed for fixing cementitious and other dense boards to timber and metal substrates. Made from carbon steel C1022 with Evolution Universal Thread and Evoshield 1000hr coating. Effective thread length of 32mm, Spoon Point drill point, drilling capacity of 0.6-1.2mm and recommended drill speed of 1500-2500 RPM.