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 pointHEX WASHER HEAD: Great for metal and flat material-to-concrete applicationsLENGTH IDENTIFICATION: Letter code on head for easy post-installation inspectionBUILDING 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 1/4" hex drive size and requires a 5/32" x 4-1/2" drill bit for installation.