Uxcell Beam Coupling Product name : beam coupling; features : set screw type(coiling clamping) Shaft usage : 8Mm to 8Mm/0.2" to 0.31"; length : 30Mm/1.2" Diameter : 25Mm/1"; material : material Aluminum : aluminum; color : Silver tone Weight : 36G; Package Content : 1 x beam coupling