●5 Pcs brass joint motor shaft coupling adapters, ideal accessories for RC Model motor, such as airplane boat model. ●5 sizes, 2 to 3mm, 2 to 4mm, 4 to 4mm, 4 to 6mm, 6 to 6mm, 1 piece for each size. ●Fit for connecting two axis with different diameters, can also be connected with a motor axis, or connecting shafts of different diameters. ●Including installing parts, 4 grub screws for each coupler. ●Simple structure, selected high-quality material, wear-resistant, and easy to assemble.