A 3 piece lockable impact universal joint set comprising 1/4", 3/8" & 1/2" drive joints. Specially design to be able to lock in-line when required. Lockable impact quality universal joint set in 1/4", 3/8" & 1/2" drives.Full 360° rotation at angles up to 40° allows access to hard to reach spaces. Specially designed to allow the U/J to be locked in-line when required. Pinless construction for additional strength.