Specifications:Material: AluminumBore: 8mmFeatures:1.Designed with double flange, admits synchronizing shaft rotations.2.It is very useful in high-reduction drives in the occasion that needs to improve the wrap-around capabilities of belts.3.Used widely in milling machine, 3D printer, drilling machine or other machinery transmissions.Package Includes:1 X 8mm Bore Timing Pulley