Impact ball joint with spring and ball detent. For machine actuation (impact driver). Drive: Square drive 1/2" in accordance with DIN 3121, ISO 1174 Output: Square drive 1/2" in accordance with DIN 3121, ISO 1174 Version: Chrome molybdenum steel Surface: phosphated Advice: Every impact socket wrench or every impact drive element must have a groove and a hole that must be locked with a securing connector pin and a securing O-ring.