15 piece metric combination spanner set with the same dimensions at both ends. Sizes 5.5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19mm. The 12 point ring end is set at a 15° angle to facilitate use on flat surfaces. The spanners feature polished heads and a satin finish for increased grip in oily environments. Made of High Grade Chrome Vanadium. Supplied in a special holder so that it can be connected with the 6512MMA and 6507JMMA spanner sets. Manufactured and designed in accordance with DIN3113A in high grade chrome vanadium steel.. All ring heads are equipped with Teng Tools "hip grip" system, which means the contact surface grips on the flat surfaces of the nut or bolt head rather than on the corner. This system helps to prevent damage to nuts and bolts and makes it possible to grip nuts and bolts which already have damaged corners..