1/2″ ratchet: 72T, 255 mm. 3/8″ ratchet: 72T, 200mm. Socket wrenches, as well as the socket drive, are made of durable, tool steel. 1/4″ ratchet: 72T, 155mm. Single Socket and Ratchets. The ratchets have a three-component handle and 72 teeth (working stroke 5 degrees).