16 mm x 5 mm ball screws; Preadjusted ball nuts for minimum backlash; NEMA 23 24 motor mounts; : More products like this : CNC Conversion Kit for Bench Mills. Heavy Metal CNC kit; Fits all bench mills with 700 mm x 160 mm table; 16 mm x 5 mm ball screws; Preloaded ball nuts for minimum backlash; NEMA 23 24 motor mounts; : More products like this: CNC Conversion Kit for ...