- Klutch Heavy-Duty Compact Air Impact Wrench - 1/2in. Square Drive Specially designed spring-type blade, a larger cylinder capacity and shorter air route delivers incredible power in a smaller tool 11,000 RPM gets the job done faster Tuned exhaust minimizes noise - less than 98 dB 1,100 IPM works the most stubborn bolts free Lightweight, sturdy composite housing means the job is completed before you get tired