Material: Brass Ms58 (2.0401), milled teeth. 20° helical tooth system, left hand. Pressure angle 20°. The teeth on the gear racks are manufactured using an overhead milling cutter. This leads to negative tolerances for dimensions a and h0: -0,2 mm. * Length = Nominal length. The real length is roughly one multiple of the pitch. Attention: These standardized left-hand gear racks always have to be paired with right-hand-toothed pinions.