Adjustable wrench head with quick, single handed pull back adjustment to grip fixings from 14mm to 32mm. Quick adjustment wrench head with serrated teeth for firm grip on even the most rounded fixings. 1/2"" square drive & square hole allowing it to be used with power bars, ratchets & extension bars. Simple. pull back action allows a quick and firm grip to fixings of any size from 14mm up to 32mm. For use on all types of bolts, including Single Hex (6pt), Bi-Hex (12pt), Star/Torx, Spline, Square etc. Manufactured from chrome vanadium for strength. 3/8""D adjustable crows foot wrench head available, please see Laser Part No. 8215.