In a set 8 pcs. Brand Matrix. Sizes; 8, 10, 11, 12, 13, 14, 15, 17, 19mm. Made of chrome vanadium steel. The hardness of the material of the working part of the key is 45 HRc. Polished chrome-nickel coating. The annular gap has 12 facets. The angle of inclination of the ring aperture relative to the plane of the key is 15 degrees.