Dodge Sleeve Coupling Hub, Flexible Rough Stock Bore Type SC, Series: D-Flex, 011H Coupling, 2-7/8 in Bore Dia, 5-1/4 in Hub Dia, 2.72 in Hub Length, 3600 rpm Maximum, 1-23/32 in Length Through Bore Rounded EPDM and neoprene element edges for full tooth engagement, even load distribution, reduced stress build up, and longer lifeOutside diameter concentric to bore for ease in alignmentInterchangeable components makes installation quick and easyNo lubrication assures trouble-free operation