Power Tools Gears and Carbon Brush: 1. Suitable for Hammer PR-38E 2. Carbon ... is professional manufacturer of power tools, and matched spare parts: armatures, stators, aluminium casting, gears and carbon brush.Gears and Carbon Brush for PR-38E ... meterial, Gear is 20CrMnTi4. Gear hardness is 53, as our tools all parts are the same hardness: armature shaft, gear, spindle. Gear ...