Power Tools Gears and Carbon Brush: 1. Suitable for Hammer PR-38E 2. Carbon ... is 53 Shaner factory is professional manufacturer of power tools, and matched spare parts: armatures, stators, aluminium ... carbon brush.Gears and Carbon Brush for PR-38E:1. 100% suitable for Hitachi PR-38E rotary hammer2 ... Gear is 20CrMnTi4. Gear hardness is 53, as our tools all parts are the same hardness: armature shaft, ...