Channellock 430CB 10-Inch Tongue and Groove with Code Blue Comfort Grips Right angle, laser heat-treated teeth grip better and last longer Undercut tongue & groove design won't slip PermaLock fastener eliminates nut and bolt failure Patented reinforcing edge minimizes stress breakage Made in the USA High-carbon C1080 steel for superior performance on the job and specially coated for ultimate rust prevention Code Blue grips are designed for durability and comfort