T-Work’s have produced this aluminium pinion gear holder for M1 pinion gears. Most 1/8th and Short Course electric motors are designed to use M1 pinion gears which fits onto a 5mm armature shaft. This convenient holder will take up to 10 M1 pinion gears and comes in black, red, orange and Tamiya blue. T-Work’s also makes the same pinion gear holder for 1/10th pinion gears.