Self-countersinking nibs under head insure seating of screw head flush with work surface

1/4 x 2 1/2 Mushroom Spike Zinc Plated (100)

35/64 x 6 Reduced Shank Drill Bit Cobalt (1/2 Shank)

6 x 2 Square Bugle Decking Screws W

1 1/2-12 x 7 Socket Cap Screw Alloy

8 x 2 1/2 Phillips Bugle Hi-Low Drywall Screws Phosphate - Carton (2500) 7/16-20 Socket Cap Screws Alloy Self-countersinking nibs under head insure8 x 2 1 2 Phillips Bugle Hi Low Drywall Screws Phosphate Coated Carton (2500) . Intercorp Strong Point hi low thread drywall screws are designed to attach gypsum board to both wood or steel studs. Meets ASTM A510 for carbon steel manufacturing. Meets ASTM C1002 for attaching gypsum board to wood or steel studs.