Pancake Head Phillips Drive Low Profile Tek Self-Drilling Architectural Metal Roof Clip Fasteners. Ideal for attaching low profile metal roof clips to steel purlins. Screw features a #3 Tek point for quick precise drilling performance in mild steel up to .175 thick with material attachment capability up to .550 thick. Fasteners supplied with a highly corrosion resistant Gray Spex coating. Low profile pancake head style ensures proper installation of metal roof panels. Sold in 250 count bags and 4000 piece cases.