500 PCS - NEW Fastener Type : Screws Size : 1 in Thread Size : #10 Finish : Galvenized High hex washer head and sharp twin lead thread design pierces and threads multiple laps of high tensile light gauge steel up to 26 gaMaster gripper low-profile pancake head, Quadrex drive screws fasten standing seam roof clips or hidden fastener profile panelsHighest pull-out values in the industryPatented flow cone grey EPDM washerMetal panel to wood girt or purling Applications: For roof or wall panel to wood frame, panel over insulation to wood framing, stitching panels, ideal for fastening residential steel roof panels