Buna N Spider Insert, Size - Jaw Couplings L050, Material - Spiders Buna N, Rated Torque 26 in-lb, 18,000 RPM Max. RPM, 0.04 HP Rating @ 100 RPM, Temp. Range 104 Degrees to 212 Degrees F, Coupling Weight (Lb.) 0.012, Max. Parallel Misalignment (In.) 0.015 in, Max. Angular Misalignment 1 Degrees , Shaft Dia. Range (In.) 1/4 to 5/8, Black Color, Length (In.) 0.433 in, Width (In.) 1.063 in, Height (In.) 1.063 in