GRK Fasteners RT Screw, Thread Size: #9, 2-1/2 in L, Thread Type: Reverse, Head Type: Trim, Drive Type: Star, Steel, Package Quantity: 2900 BX, Thread Length: 1.575 in, Drive Size: T-15, Applicable Materials: Composite, Wood, Shear Strength: 425 lb, 576 lb Tensile Strength