1/2 Pear Head Ratcet. 1/2 Extensions: 130mm, 250mm. 1/2″ 12 Point Spark Plug Sockets: 5/8″, 13/16. 1/2 6 Point Sockets: 8mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm. 1/2″ 12 Point Sockets: 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″, 13/16″, 7/8″, 15/16″, 1″.