Carbon Brush Size (Approx.): 13 x 4.4 x 3.9mm / 0.5" x 0.17" x 0.15" (L*W*H)
Any appliance should be completely isolated from the electrical current before replacing the carbon brushes.
Please meaure all dimensions before take an order: Length-Width-Thickness by measuring an unused sample with vernier caliper（not ordinary rulers）
Worn brushes are often the cause of a poorly running motor. Replacing brushes can fix an intermittent motor and restore a motor's electric braking.
It's normal for small sparks to appear when the brushes rub against the motor's armature, but excessive sparking could mean you need new brushes.