Prime Swivel Impact & Extension SocketS have a swivel joint as a built in feature. These are useful for tightening of nuts located at difficult angular positions which cannot be reached with sandard sockets. These are available in 3/8" and 1/2" Square Drives to cover nut sizes 6 mm to 24 mm. Non standard sizes can be manufactured on request. PRIME Swivel Impact Extension Sockets are also available for bolt clearance requirements.