Description:The rigid coupling is 90 degree fixing design, and it is constant through four mechanical device screws.Widely used in motor, hardware, mold, mechanical transmission occasions.Specification:Material: aluminum alloyColor:as picture showType:D20x25(4-8),D20x25(5-5),D20x25(5-6),D20x25(5-8),D20x25(6-6),D25*30(5-10),D25*30(6.35-8),D25*30(6.35-10),D25*30(8-8),D25*30(10-10)Screw Hole Diameter: 4mmTransfer Bore Diameter: Multiple SpecificationQuantity:1PCSuitable for 3D-printers, motor couplings, ship models, vehicle models, plane models, etc.Package Includes:1pc x Coupling Note:1. The genuine shade of the thing may be barely various from the photographs shown on web page attributable to many factors similar to brightness of your computer screen and light-weight brightness.2. Please allow slight manual size deviation for the data.