The PZ-64 mole grip (locking) style pliers are the latest addition to the superb range of 'neji-saurus' screw pliers by ENGINEER (Japan). These are smaller style pliers 150mm (6") in length (a larger version of this product is available - search for the ENGINEER pz-65). The neji-saurus range of screw pliers have been specially designed to remove screws with damaged heads - quickly & easily. just grip the screw head & twist it out (& unlike other pliers, the neji-saurus pliers won't slip or slip off). These pliers have a unique jaw serration design (with the grooves arranged both horizontal & vertically) which ensures a firm grip on the screw. It's this jaw design which differentiates the pliers from standard pliers.