18mm/0.3in output shaft, the motor uses high quality steel shaft, high accuracy structure, run smoothly and silently. 2High quality gears are heat treated after grinding, which has better wear resistance. 3Filling imported lubricating oil between the gears, with low friction, low power consumption, slow temperature rise, and quieter. 431mm/1.2in high quality copper motor, small size, high torsion, low noise, long service life. 5Used in household appliances, power tools, intelligent systems, automation control and other industrial drive devices, etc. Item Type: Motor Material: Steel, Copper, Brass Output Shaft Size (Diameter x Length): Approx. 8 x 15 mm / 0.3 x 0.6 in Purpose: Industrial Drive Device Shaft Type: D Type Encoder Supply Voltage: 3.3-5V 1 xMotor 1 xConnection Line Please allow 0.30.7in error for manual measurement.