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: Set includes 1 each: HTS34 thru HTS178 Weight: 22 lbs.