NM coupling consists of two hubs and flexile ring able to compensate all types of shaft misalignments, operate effectively in temperature range of -40"C to +100"C. Our size from 50, 67, 82, 97, 112, 128, 148, 168; Material: Cast iron GG25; Bore: Pre-bore, Splined, Hex, round, set screw or keyway or according the customer's requestment. Competitive price in Top quality in China.