• Single groove sheave for use with 3L, 4L or A section belts To be used with "H' style bushing (not included) Split taper "H" bushing design offers the most concentric running positive lock on the shaft for reduced vibration All sheaves are statically balanced to assure smooth, vibration free performance Manufactured from close grain cast iron and machined to the closest tolerances possible Painted and individually packaged Furnished with standard key seats and hollow head set screws