Specification: Rated voltage: 10.8VNo-load speed: 20000RPM ± 5/100Rotation Direction: CCWTeeth Size: 8 x 5.3mm/ 0.31 x 0.21 inch(D*H)Total Size: 77 x 37mm/3.03 x 1.45(L*D) Feature:New original, extreme axial electric fan ventilation with heat.Stable and reliable.Durable in use.Widely used in hand drill, electric screwdriver, all types models etc. Package included:1 x Gear motor and 12 teeth