Works Where an Impact Wrench Won't Fit. The right angle design gives the technician access to hard-to-reach bolts. Works great on harmonic balancer bolts, transmission bolts, cam bolts and others where an impact wrench won't reach. The tool will both loosen and tighten. Use with an air hammer and the 43370 Driving Wrench, which can be purchased individually or used from our 43300 Pneumatic Fan Clutch Wrench Set, 1/2\" breaker bar and 1/2\" impact sockets.