This Flexible Sleeve Coupling is developed by Chinabase Machinery. The inch series is consisting of CLX, CLC, SPX, and SPC while the metrice series is consisting of MCLX, MCLC, MSPX and MSPC. The CLX, and MCLX are one-piece clam style rigid coupling without key way. The CLC and MCLC are one-piece clam style rigid coupling with key way. The SPX and MSPX are two-piece clam style rigid coupling without key way. Lastly, the SPC and MSPC are two-piece clam style rigid coupling with key way.