Buna N Spider Insert, Coupling Size L225, Outside Diameter 4 31/32 in, System of Measurement Inch, Maximum Speed 4,600 RPM, Horsepower @ 100 RPM 3.7 hp, Spider Material Buna-N, Maximum Torque 2,340 in-lb, Parallel Misalignment 0.015 in, Durometer Hardness 80A, Angular Misalignment 1 Degrees , Color Black, Compatible Hub Manufacturer Part Number L225, Fail Safe Yes, For Maximum Hub Bore 2 5/8 in, For Misalignment Type Angular, Parallel