Williams SFH-1809AW Straight Pattern Box End Striking Wrench, 1-1/2-Inch 1 1/2-Inch Striking face wrenches are designed to be struck by a hammer on the anvil area in order to loosen frozen fasteners or to set and tighten fasteners Anvil is proportional to opening size Special heat treating provides maximum durability for long life Straight handle design resists springing while allowing the fastener to turn more easily