CNC machined from strong 6061-T6 aircraft-grade aluminum. Fits 28mm diameter Brushless Spinner Bar Motor. Upper screw tightens clamp on motor body. Lower two screws attach Motor Mount to the Bottom Plate of the KINETIC kit and allow for belt tensioning adjustment independent of clamping. Single piece, single clamp screw design clamps more evenly on motor and has a smaller envelope than other brands. The price also includes hardware shown. Machined mount is made in the USA.usa