GRK Fasteners RT Screw, Thread Size: #8, 3-1/8 in L, Thread Type: Reverse, Head Type: Trim, Drive Type: Star, Steel, Package Quantity: 514 PAIL, Thread Length: 2.08 in, Drive Size: T10, Applicable Materials: Composite, Wood, Shear Strength: 360 lb, 499 lb Tensile Strength