Key Details & Specifications Brand: Blue-Point by Snap-on Tool Type: Compact / Mini Air Impact Wrench Drive Size: 1/4" Square Drive Power Source: Pneumatic (Compressed Air) Air Inlet Size: 1/4" NPT Design Feature ("QC"): The "QC" designation in the model suffix usually indicates a Quick-Change anvil or chuck mechanism, allowing mechanics to swap out 1/4" drive sockets or screwdriver bits rapidly. Common Use: Used by automotive mechanics and industrial technicians for light-duty fastening tasks, tight engine bays, and interior dash work where larger 3/8" or 1/2" impact guns will not fit.