Hard-to-reach areas are no problem with the wide range of universal extension wrenches from Apex Tools. Quality design and construction give APU37M Apex 3/8” Standard Metric 7 Piece Universal Wrench Set a long service life and durabilitywhile on the job though remember universal extension wrenches, are not to be used with impact drivers. APU37M Apex 3/8” Standard Metric 7 Piece Universal Wrench Set are made from a tougher and more ductile alloy steel which is then heat treated for extra durability. Other universal extension wrenches can ”flop” making engagement difficult.