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. 21mm Length. 49.5mm