Power Pro Concrete Screw Anchors are the best performing code approved anchors for fastening into concrete and masonry. BLACK COLOR: Matches or complements various projects including railingSUPERIOR CORROSION PROTECTION: 50 percent greater corrosion protection vs. competitionHIGH STRENGTH: Manufactured from heat-treated carbon steel for strength and durabilitySUPERIOR STRENGTH DESIGN: Wide, serrated threads cut fast, easy, and clean into concreteTHREADED TO TIP: Designed to quickly penetrate and sink into wood without a chisel pointFLAT HEAD: Great for wood-to-concrete and countersunk hole applicationsUNDER HEAD MICRO-NIBS: Help flat-head screws cut a clean countersink in woodSTAR DRIVE: Six contact points spread out torque for no-strip installsBUILDING CODE APPROVED: California Building Code Approved, Florida Building Code Approved, and Miami-Dade County Product Control in processSAFE FOR USE WITH TREATED LUMBER: Parts are AC257 Treated Lumber approvedFeatures a T30 star drive size and requires a 3/16" x 5-1/2" drill bit for installation.