Perfect for most 3018 CNC Routers on the market, including Genmitsu 3018-PRO, 3018-PROVer, 3018-PROVer Mach3, 3018-MX3, 1810-PRO. The diameter of the motor is 44mm. （Note: The stock spindle holder of the 3018 CNC machine could hold the spindle which diameter is between 42mm and 44mm ) More Quieter The brushless spindle motor is much quieter than other normal motors, up to 26dB quieter during operation. Long Service Time The brushless design enables a much longer service life of about 50,000 hours. Easy Upgade This brushless spindle motor comes with a drive board, USB cable and the Collet Holder is pre-installed already. One step replacement. This brushless spindle motor does not require an additional power supply. You just need to plug it into the control board of your CNC router (please refer to the wiring diagram). Also, it does not require additional hardware to control the speed. You can control the speed in Candle. Step 1 - Pop the collet into the ER11 nut Step 2 - Insert the bit into the collet. Make sure that the collet is locked tightly and its plane is aligned with the plane of the ER11 Nut. Step 3 - Put the ER11 nut back in the ER11 chunk Step 4 - Tighten the ER11 nut with wrenches Specifications: Rated Voltage: 24V DC Voltage Range: 18-24 V DC Rated Load: 0.142Nm Operating Position: Output shaft for vertical No Load Speed: 12000rpm±10% Rated Load Speed: 10000rpm±10% Number of Poles: 6 Number of Phase: 3 Driving Method: 3 phase full wave rectified (PWM) Package List 1 x Spindle Motor ( collet is not included) 1 x Driver Board with case 1 x 200mm Length Cable 1 x 800mm Length Cable 1 x 200mm Dupont Cable 1 x Wrench