TB Woods BK501 FHP Bored-to-size V-Belt Sheave, B Belt Section, 1 Groove, 1" Bore, Cast Iron, 4.75" OD, 5270 max rpm Classical V-belt sheave fits widely available, classical profile V-belts suitable for use in many existing drive designs Cast iron for resistance to wear and galling B belt or cross section One groove for single belt use