GRK Fasteners No. 20 S X 4 in. L Star Washer Head Structural Screws 25 pk

The screws are using self tapping specially hardened steel screw, W-Cut thread design as zip tip, climatek coated, sharp threads and points to built in washer for interior or exterior use in carrying beams, ledger boards, stair rails, deck posts, playground equipment and other professional applications.
W-cut - provides low installation torque which allows for fast driving and ease of install
Unique thread design and washer style head- unique thread design draws two substrates together while washer head allows zero gap joints
Zip-tip - allows for faster penetration
Climatek coated screws provide corrosion resistance in pressure treated wood with corrosive ground contact
ESR-2442 approved for structural applications