This Teng Tools 10 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° 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 Manufactured to DIN 3113A standards Supplied in a handy plastic holder which is ideal for easy transportation mounting to a wall or fixing on a workbench panel The TEN6510A 10 piece set contains the following spanner sizes 8mm 10mm 11mm 12mm 13mm 14mm 15mm 16mm 17mm and 19mm