Expert Quality, 20mm socket set manufactured from chrome vanadium steel hardened and tempered with a polished finish. The unique hollow socket technology of the Draper Expert 'Go Through' ratchet and sockets is ideal for long fixings. The sockets are edge driven. This allows a fixing to pass through the head and avoid the depth restriction of conventional sockets and ratchets. Packed in tough plastic storage case with soft grip handle. Contents: 13x 'Go Through' sockets: 10, 11, 12, 13, 14, 15. 16, 17, 18, 19, 20, 21, 22mm, 1x Reversible fine tooth ratchet, 3x Extension bars 38, 75, 150mm, 2x socket converters 20mm x 1/4" Sq. Dr., 20mm x 3/8" Sq. Dr. Manufactured and tested generally in accordance with DIN3122 and ISO3315 Specifications