Impact o-ring for securing impact socket wrenches and impact screwdrivers. For impact socket wrenches from 17–32 mm. Thickness: 4 mm Advice: Can be used in combination with the RECA connector pin for impact socket wrench (item no.: 0700 121 171). Every impact socket wrench or every impact drive element must have a groove and a hole that must be locked with a locking pin and a circlip.