Product Info Catalog Hardware Fasteners Screws Tapper Concrete Screw with Phillips Flat Head, 1/4 x 3-1/4-In., 100-Pk. Request a Quote UPC: 08236385755 SKU: 724591 Model Number: 375311 Rawl, 100 pack, 1/4" x 3-1/4" phillips flat head tapper concrete screw with bit, blue perma-seal coating, 1-3/4" embedment, ultimate tension 4,000 psi concrete 2,330 lb, ultimate shear 4,000 psi concrete 2,390 lb.