solid 2mm axle, highly durable 60HRc, axle is very fine grinded and polished, the 2mm diameter is very accurate with maximum deflection of 0,001 mm (.00004"), great straightness along the entire length, it is crooked to max. 0,01 mm (.0004") throughout the entire length, ends are also grinded, exact diameter of this axle is 1,992mm (.07838"), lenght is 51mm (2") the best axle ever available for Scale racing