#1 Square head required black phosphate drywall screws
There are three different types, which are optimized for different applications: S, W and G. Type S has fine threads and a sharp point and is intended to fasten drywall to steel studs less than 0.033" thick. Drill point screws are self drilling and used with thick gauge metal from 0.033 to 0.112". Type W has coarse threads and is used to attach drywall to wood studs. The alternating high and low threads of high-low thread drywall screws have better holding power than coarse thread in wood and can also be used with steel studs. Coarse pitch, high thread Type G screws are designed to attach drywall to drywall.