"Patented design allows removal of bolts and nuts up to 90% rounded by biting exclusively into the flats, only griping tighter with each impact","Use to remove rusted and rounded hex bolts and nuts and install new fasteners","22mm (7/8”) outside hex body for low profile use when paired with a wrench","Lifetime warranty, forged and heat treated CRO-MO 15MM HEX GRIP IMPACT SOCKET HG11M15 | Matco Tools