Diameter: 1/4" Diameter 2: 15/32" Length: 2" Material: Steel Finish: Black Phosphate Head Style: Flat (T-30 Star Bit) Point Type: Type F Drill Size: 7/64" Hole Thread Size: 20 (Coarse) Type: Floor Board Screw The Ultimate Construction Screw - Fully specced for structural applications. Star and Hex Drive reduces Cam-out and for easy slip-free driving. Unique serrated thread for secure fastening. Most of our line offers a Type 17-point which eliminates the need for pre-drilling and reduces wood splitting. (Timber Screws, Hex Head Construction, Ledger Screws are not equipped with Type 17-point). Exterior screws are encased with our premium XL 1500 coating to resist the environment, wood acids treatment. Top quality alloy steel and are case hardened. Engineered to make them the best choice for professional and home use.