Using proven Vise-Grip technology, this tool locks on 3 sides of a hex head fastener. Tremendous force can be applied without damaging or slipping off the fastener. Helps eliminate rounding of head caused by slippage. Locking wrench adjusts to a range of standard and metric wrench sizes. Wrench has wire cutter and knurled jaw tips. Carded. 7', adjusts from 7/16' (11mm) to 3/4' (19mm).