Channellock 444 Tongue & Groove Straight Jaw with Narrow Nose, 12" Air brake tool Easily checks brake clearance for automatic or manual slack adjusters Right angle, laser heat-treated teeth grip better and last longer Undercut tongue & groove design won't slip Made in the USA Patented reinforcing edge minimizes stress breakage PermaLock fastener eliminates nut and bolt failure High-carbon C1080 steel for superior performance on the job and electronic coating for ultimate rust prevention