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: Construction Screws Number in Package: 20 pk Finish: Climacoat Driver Bit Included: Yes Packaging Type: Clamshell Self Drilling: Yes Thread Type: Self Tapping Indoor or Outdoor: Indoor and Outdoor Self Tapping: Yes Diameter: 5/16 in. Material: Steel Color: Yellow