Pro-Twist Phosphate Coated Trim Head Screws are designed to attach wood trim and gypsum drywall to light gauge steel or wood studs. Sharp point removes the need for pre-drilling and fine threads create a strong hold in both metal and wood substrates. #2 Square drive reduces the chance of cam outs during installation and the small-profile trim head is easily concealed in the final product. Phosphate coating speeds driving and provides some corrosion resistance. Meets or exceeds ASTM C-1002 and C-1513. Pro-Twist. Driven by quality, chosen by professionals!