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From the Manufacturer The Channellock # 421, 9.5-Inch SAFE-T-STOP Tongue and Groove Plier, has right angle teeth grip in all directions for maximum bite and minimum wear. Its SAFE-T-STOP lower jaw combines with expanded reinforcing rib to prevent handles from contacting each other. Patented undercut tongue and groove design assures no slip jaw action. Patented reinforcing edge minimizes stress breakage. Patented PermaLock fastener eliminates nut and bolt failures. It has distinctive CHANNELLOCK BLUE comfort grips.