uxcell 8mm Shaft Dia 18.9mm OD 12 Tooth Copper Shell Electric Motor Commutator Product Name : Commutator;Color : Copper Tone Material : Copper, Steel;Size : 8 x 18.9 x 12.3mm / 0.31" x 0.74" x 0.48" (Shaft D*OD*H) Gear Tooth Quantity : 12 Pcs Net Weight : 9g Package Content : 1 x Commutator