Grip-Rite structural screws offers a reliable solution for decks, fences, pergolas, and other exterior projects. Grip-Rite structural screws offer versatility, speed, and longevity in load-bearing exterior wood construction projects. 20 pieces per package Flat Head Phillips drive design Type 17 point course thread for easy, quicker penetration into wood without pre-drilling Faster than lag screws in exterior structural wood applications Approved for use in treated lumber Protected by Grip-Rite's Primeguard Plus lifetime coating for improved corrosion resistance Cobalt blue packaging features easy to read iconography, lateral load value references, and a scannable QR code that links directly to the ICC report for technical specifications Replaces 1/4inch, 5/16inch, 3/8inch, and 7/16inch Lag screws Finish: Polymer-coated Manufacturer Color/Finish: Blue Length Measurement: 8-in Screw Thickness: 5/16-in Collated: No Drive: Star For Use on Brick: No For Use on Composite: No For Use on Concrete: No For Use on Drywall: No For Use on Metal: No For Use on Plastic: No For Use on Vinyl: No For Use on Wood: Yes Head Type: Flat Material: Steel Materials Fastened: Wood to wood Multi-Material: No Package Quantity: 20 Point Type: Type 17 Thread Type: Coarse Use Location: Exterior ACQ Approved: Yes CA Residents: Prop 65 Warning(s): Yes UNSPSC: 31161500