Straight Service Wrenches are made in the U.S.A. A special purpose Thin Head Single End wrench with a straight slotted opening. The thin pattern helps with use on jam nuts and in confined areas. They are generally used for servicing pumps, glands, valves, etc. Straight Service wrenches are Drop Forged from A-4140 Alloy steel bar and are available in fractional sizes from 1" through 2-1/4" in Chrome finish.