Hercules 20V Brushless Cordless 3/8 in. Compact 3-Speed Impact Wrench – Tool Only - Delivers up to 525 ft. lbs. breakaway torque and 229 ft. lbs. of fastening torque - Amazon.com
Review: Harbor Freight Hercules 1/2 Inch High Torque Impact Wrench Gets It Done
Hercules 20V Brushless Cordless 1/2 in. Compact 3-Speed Impact Wrench (TOOL ONLY | eBay