Martin AK66 1 FHP Sheave BS, 3L/4L Belt Section, 1 Groove, 1" Bore, Class 30 Gray Cast Iron, 6.45" OD, 3846 max rpm, 5.86" Pitch Diameter/6.2 Datum Classical V-belt sheave fits 3L/4L profile V-belts Class 30 gray cast iron for resistance to wear and galling Suitable for light-duty, fractional horsepower motors of 1 horsepower or less Set screw for secure attachment to shaft One groove for single belt use