The big difference between the Standard and Heavy Duty Auto Dolly is in the caster type and size

Any application requiring access in tight or confined spaces

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Shoe horn design on the other end makes it easy to slip the spring back over the post

AFF 1/2" Drive Super Duty Air Ratchet - 7021 Mercedes-Benz_C63 AMG_2012 The big difference between theAFF 7020 1 2 inch drive air ratchet is made for exhaust system work, air conditioner, water and fuel pump, and general engine and body shop work Features: Fast 150 RPM head and powerful torque output Ball type socket retainer allows for quick socket changes Durable aluminum housing Intake screen protects motor for extended shop life Specs: Drive: 1 2in Max torque by hand (reverse): 70 ft lbs Max torque by air (reverse): 50 ft lbs Free Speed (RPM): 150