Spinner Bar CNC machined from strong 7075-T6 aircraft-grade structural aluminum. Threaded for a total of eight 5/16-18 screws for teeth. Bored and reamed for two Needle Roller Bearings which are installed. The 1.5 Inch Spinner Bar Pulley interlocks with Bar to better transmit power and reduce shear forces on screws. The .75 Inch Motor Pulley with dual side-by-side set screws ensures solid attachment to motor shaft without slippage/rotation. Titanium axle is threaded on each end, and also has a screwdriver slot in each end to prevent rotation while tightening. Spinner Bar Motor Mount allows for belt tensioning adjustment independent of clamping. Also, includes four 5/16-18 steel screws (teeth), four nylon flat washers, two steel locking nuts and 2L x 9″ v-belt.