CHANNELLOCK® 440 12" 440® Straight Jaw Tongue and Groove Pliers. CHANNELLOCK® Straight Jaw Tongue & Groove Pliers are built to last with a PERMALOCK® fastener to eliminate nut and bolt failure, patented reinforcing edge to minimize stress breakage and laser-hardened teeth to provide a better, longer lasting grip. CHANNELLOCK® Straight Jaw Tongue & Groove Pliers are made in USA and forged from high carbon U.S. steel that is specially coated for ultimate rust prevention.