PWR DRIVE CST Structural screw - Oversized Flat Head - 5/16 in x 4 in, Box of 50

• Specially engineered threads for added strength • New T-25 or T-40 firm-grip drive • No pre-drilling necessary thanks to self-drilling threads and Type 17 point • Oversize flat head with ribbing embeds into the wood for an incomparably clean finish • Head markings • "Sticky" star drive • Wide flat head with nibs and cutting serrations for easy countersinks • Type U anti-friction threads reduce friction on the shank and extend the battery life of your tools • Golden color is ACQ compatible and ideal for pressure-treated lumber • Strong, fast, and efficient operation • Head Type: Oversized Flat Head • Drive required: T-40 • Drive Size: T-40 • Thread Type: Coarse Thread and Type 17 • Point Type: Type 17 • Specific Application: Structure Assembly • Standards and Certifications: ICC ES: ESR-4558 • Threading: 2/3 threaded screw • Finish: ACQ Rustproof • Function: General Structural and Construction Screws • Steel Grade: Tempered • Type of Wood: Lumber, Treated Wood