It will allow you to mount a chinese DC spindle to ShapeOko's makerslide profile. Motor diameter is 52mm. Or use two of the lower profile v3, top and bottom part of the motor.You will need 4x M5 countersunk screws for fixing the mount to makerslide extrusion and 2x M3 screw and nut for tightening the mount grip. OpenSCAD source code is provided so you can adapt the mount for other profiles easily. This is a similar motor http://www.ebay.com/itm/300W-12V-24V-36V-48VDC-Engraving-Machine-Carving-MILLING-GRINDING-SPINDLE-MOTOR-/151033851776?pt=LH_DefaultDomain_0&hash=item232a51af80 I have created a new version with countersunk holes for fixing screws. Older version will need you to heat up the screws with a solder to leave them flush to support's inner surface.