This air impact wrench has a 3/8” square drive and an anti-vibration mechanism. It has a forward/reverse knob at the top of this tool. Power: 17.2kg-m. It has a long-lasting frame as it is made of highly resistant materials with special anti-rust and anti-corrosion finish. This is a durable impact wrench with a 3/8” square drive and it is strong enough to withstand heavy use.