Simpson #7 1-5/8" Self-Drilling Siding Screw, 410 Stainless 5000PkModel No. F07T162TDB Coating Material. Type 410 Stainless Steel Screw Size. #7 Length (in.) 1 5 8 Head Diameter (in.) 0. 230 Drive Type. #1 Square Head Type. Trim Head Thread Length (in.) Full TPI. 19 Max. Grip Length (in.) 1. 169 Point Type. Drill Point Packaging Qty. 5000 The common application for this screw is for attaching wood siding, wood panels and metal trim to steel studs. Features include a trim head, #3 drill point and #1 square drive. Key