Extension sockets are with built-in integral extension. These are suitable for impact applications and are available in single hex configuration in rigid as well as swivel joint design. Industrial extension sockets are provided with locking ring and pin and are available in various across flat sizes in 3/8" & ?" square drives with different lengths ranging from 100 mm to 250 mm.
These are for hand operation only and are available in ¼" to ½" square drive covering Bolt/Nut across flat sizes 4 to 34 mm ( ¼" to 1 3/8" SAE) and equivalent British Sizes. Heavy duty sockets are available in ¾" and 1" square drives covering across flat sizes from 19 mm to 85 mm (9/16" to 3 ½" SAE) and equivalent British sizes. These heavy duty industrial sockets are designed with a positive locking for its attachment with the driving tools having spring loaded ball & button. Deep sockets are also available to accommodate long studs.
These sockets have a built in swivel joint for impact applications. The swivel is a simple coupling device that allows the thing fastened to turn around freely upon it. It is a flexible sockets particularly useful for tightening nuts located at different angular positions. These are available in 3/8" & ½" square drives from 7 mm to 24 mm across flat & equivalent SAE sizes. The swivel sockets with built in extension are also available to cover reach up to 200 mm.