Product Description Double ring spanners - 6 x 7mm, 8 x 9mm, 10 x 11mm, 12 x 13mm, 14 x 15mm, 16 x 17mm.Double ring spanners contd. - 18 x 19mm, 20 x 22mm, 21 x 23mm, 24 x 27mm, 30 x 32mm.Made from high grade chrome vanadium with polished heads and a satin finish for extra grip in oily environments.The Teng Tools concept is based on each tool having its own place. Each TT set acts as a part in an organised system by being clicked together with other TT sets and fits perfectly in your service case, tool box or roller cabinet. No space is wasted and each tool sits perfectly in place. This means it is much easier to see whether any tools are missing at the end of the day.5 Steps to Get Organized.Choose storage: case/top box, middle box or roller cabinet.Choose the TT- sets you would like..Take off the lid.Click the sets together.Place them in the storage!.) Set Contains: 1 x double ring spanner 6 x 7mm;1 x double ring spanner 8 x 9mm;1 x double ring spanner 10 x 11mm;1 x double ring spanner 12 x 13mm;1 x double ring spanner 14 x 15mm;1 x double ring spanner 16 x 17mm;1 x double ring spanner 18 x 19mm;1 x double ring spanner 20 x 22mm;1 x double ring spanner 21 x 23mm;1 x double ring spanner 24 x 27mm;1 x double ring spanner 30 x 32mm