Grip-Rite PrimeGuard Plus 5/16 In. x 5 In. Hex Washer Head Structural Screw

Dual drive power head offers flexibility to choose either the included hex driver or star drive bit to fasten the screw. Type 17 point for quicker penetration into the wood. A 3-digit code is stamped into the head for easy spec reference. Faster lag screws in exterior structural wood applications - no pre-drilling. Approved for use in treated lumber. Free bit included.