Power Tools Gears and Carbon Brush: 1. Suitable for CM4SB 2. Carbon Brush ... , and matched spare parts: armatures, stators, aluminium casting, gears and carbon brush.Gears and Carbon Brush for CM4SB:1. 100% suitable for ... the same hardness: armature shaft, gear, spindle. CM4SB Marble Cutter Gears and Carbon Brush