The Hk1 from Expedition Tools is an adjustable wrench with hydrokinetic liquid core technology, a construction that allows for a slimmer, stronger and easier to use speciality tool. Cold-forged, nickel-plated steel construction and an ergonomic design help this wrench fit into more places than any other adjustable. Fits 23 fastener sizes, from 1/4" to 3/4" and 7 mm to 19 mm.