General description A set of double-ended keys featuring one end with a Star profile (short format) and the other end with a ball-ended Hex (long format), providing a total of 16 sizes in 2 formats. Technical specifications Ball end Hex sizes: 2, 2.5, 3, 3.5, 4, 4.5, 5, 6 mm Star sizes: T9, T10, T15, T20, T25, T27, T30, T40 Material: S2 steel