Special designed easy removal and replacement of glow plugs. 3/8″ Dr., 6 point type. Contents:Universal socket 8, 9, 10, 12, 14, 16 mm. Extension bar 3/8″ x 3″(JTC-3607).Socket length: 83 mm. Please also check our ebay store:http://stores.ebay.com/topautotoolsClick here to visit our ebay store! We Accept PayPal Only.