Ramset Powder Fastening Systems 2-1/2-Inch Washer Pin w/Ramguard (100 per box) ITW Ramset powder actuated fasteners are specifically fabricated to meet the exacting requirements of toughness and durability that enable them to penetrate dense concrete and structural quality steel Coated to improve corrosion resistance in treated lumber and other applications Washer increases bearing surface against the material to be fastened Designed for use in treated lumber applications Meets the requirements of toughness and durability that enable them to penetrate dense concrete and structural quality steel Shank diameter = .145 Head diameter = .300 Comes 100 per box Powder actuated fasteners