Description:The inflexible coupling is 90 diploma solving design, and it's constant through 4 mechanical device screws.Widely used in motor, hardware, mold, mechanical transmission occasions.Specification:Material: 45# metal (GB)Color:RedLength: 20mmDiameter: 12mmType:2-2,2-2.3,2-3,2-3.17,2-4,2-5,2-6,2.3-3,2.3-4,2.3-5,3-3,3-3.17,3-4,3-5,3.17-3.17,3.17-4,3.17-5Screw Hole Diameter: 4mmTransfer Bore Diameter: Multiple SpecificationPackage Includes:Coupling x 1Screw x 4Note:1. The genuine color of the thing may be barely diversified from the photographs shown on web content caused by many points corresponding to brightness of your computer screen and lightweight brightness.2. Please allow slight manual size deviation for the data.