cross recessed pan head tapping screws din7981 self-tapping screws cross recessed pan head tapping screws din7981self tapping screwsfeatures:1.standard:din7981,GB , BS,2.material:carbon steel , stainless steel , alloy steel ,3.size:2.9-6.34.lenght:6.5-75mm5.finish:zinc plated , yellow zinc plated , plain ,6.packing:box packing , bulk in carbon , self tapping screws din7981