A professional, matt chromed hexagon socket produced in accordance with ISO9000 & AS954 specifications for increased torque & reduced risk of rounding fasteners. Teng Tools (named after a 12th century folk hero) specialises in a range of mechanics hand tools to suit the price conscious professional user & the quality conscious DIY enthusiast. The tools have been designed to Tengs own specifications, which meet or exceed British, European or Federal standards. Size 24 mm. Length 50.8 mm. Teng Tools (named after a 12th century folk hero) specialises in a range of mechanics hand tools to suit the price conscious professional user & the quality conscious DIY enthusiast. The tools have been designed to Tengs own specifications, which meet or exceed British, European or Federal standards.