This teng tools 7 piece combination spanner set consists of spanners which have the same dimension at both ends one end has an open head and the other has a 12 point ring head which is set at a 15 degree angle to increase ease of access to the fastening the spanners are manufactured from chrome vanadium steel for strength and durability and have a satin finish and polished heads supplied in a handy storage tray the ttx2032 7 piece set contains the following spanner sizes 20mm 21mm 22mm 24mm 27mm