Durable alloy steel construction: Sockets and accessories are made from chromium-vanadium alloy steel and are drop-forged for resistance to deformation, while the ratchet mechanism uses strong chromium-molybdenum steel. 19 metric socket sizes: Includes 1/2in sockets in 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 24, 27, 30, 32 and 36 mm, covering a wide range of automotive, workshop and maintenance tasks. Deep and spark plug sockets: Supplied with 15, 17 and 19 mm deep sockets plus 16 and 21 mm spark plug sockets, providing additional reach for recessed fasteners and common engine servicing applications. 72-tooth ratchet and accessories: The 1/2in ratchet is complemented by 125 mm and 250 mm extension bars, a 1/2in universal joint and a male 1/2in to female 3/8in adaptor for greater flexibility when working in restricted areas. Organised metal storage case: All 29 components are stored in a robust metal case with a flexible internal insert that gives each tool a dedicated position and helps prevent movement during storage and transport.