GRK Fasteners R4 Framing and Decking Screw, Thread Size: #8, 2-1/2 in L, Drive Type: Star, Steel, Package Quantity: 650 PAIL, Multi-Purpose, Thread Length: 1.57 in, Drive Size: T15, Applicable Materials: Cement Fiber Board, Melamine, Particle Board, Plastic, Sheet Metal, Wood