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.
Brand Name: GRK Fasteners Callout Size: No. 20 Length: 5-1/8 in. Drive Style: Star Head Type: Round Head Product Type: Rugged Structural Screw Number in Package: 50 pk Self Drilling: Yes Finish: Climacoat Thread Type: W-Cut Diameter: 5/16 in. Driver Bit Included: Yes Color: Yellow Material: Steel Indoor or Outdoor: Indoor and Outdoor Self Tapping: Yes Packaging Type: Clamshell