PETOL HAMMERTIGHT Wrench Retainers are safe and easy-to-use tools designed to hold a striking wrench (also called a slugging or hammer wrench) on a nut for a safer, hands free, one man operation. The HAMMERTIGHT tool easily threads onto the stud. A spring loaded plate enables the wrench to be repositioned on the nut without removing the retainer. Specifications: Fits Stud Size: 1-7/8" – 8 Nut Size: 2-15/16" Overall Length: 3-1/8" Weight: 2-3/8 lbs. How it works: Place wrench on nut and thread retainer onto stud. Lift up on wrench to compress spring loaded retaining plate. Reposition wrench on nut and release spring loaded plate and continue.