Features: 1Shaft Couplers: Ensuring firm connection, the flange coupling connector with 8mm inner diameter enables more stable shaft transmission. 2Extensive Work: Widely applied to motor, hardware, mold and so on, has 4mm small hole, 32mm bottom diameter and 16mm cylinder diameter. 3Including 5Pcs: There are 5pcs guide shaft coupler in the set, and the large quantity will surely satisfy your needs compatible with replacement. 4Steel Material: The utilization of C45 steel material and exquisite workmanship will extend the service life, durable compatible with long term use. 5Easy to Install: Comes with a light weight and a compact size as well, the simple installation can be quickly completed within minutes. Package included: 5 x Flange Coupling Connector 10 x Set Screw 1 x Wrench