TRUSS HEAD/Self tapping, Stainless steel, 8R, 1/2 8RX1/2THBSS pack of 100Stainless Steel Sheet Metal Screw | 1/2-in, #8 Type B ThreadThese truss head tapping screws with type B threads are self-tapping and machined from stainless steel. This truss head Phillips tapping screw (Alternate Part# 8RX1/2T..