Screw Products, Inc. CCTX-516400100 5/16 Bronze Star Exterior Construction Lag Screws Bronze Star Exterior Coating Compatible with pressure treated lumber and can be used with tannic wood such as Cedar and Redwood Star Drive offers twice the torque over Phillips or square drive screws Built On Round Washer Head Type 17 Notched Extra Sharp Point reduces the need for pre-drilling Tiny Cuts on the Threads Reduces the Torque needed to drive the fastener and provides maximum holding power