NCPRO brand spindle for 3018-PRO Desktop CNC Routers. We stock both 42mm diameter, 8-10K RPM, 775 Spindle “motors” and 52mm air-cooled upgrade spindles with ER11 adapter and 1/8 in. (3.175mm) collets. Note: The stock 775 type 8-10K spindle is quite capable and appropriately matched to the stock 3018-PRO machine. For those seeking additional torque, look to the 200W 52mm upgrade spindle. We strongly discourage the use of 775 type 20K RPM “upgrade” spindles, driven directly from 3018-PRO control boards with integrated spindle control (Woodpecker CNC V3.X and similar).