Ruland Manufacturing curved jaw coupling spiders are designed to dampen shocks and accommodate misalignment (angular, parallel & axial) between coupling hubs. The spider couplings fit between two coupling hubs for a secure connection. They are made from polyurethane, do not require lubrication and can hold up against dirt, sand, grease, oil & moisture. These coupling inserts are used with coupling hubs and can handle torque ratings up to 8000 RPM. Choose from a wide range of coupling spiders, available in 4 and 6 arm options on Raptor Supplies.