2BK40H Cast Iron Bushed Pulley for V-belt Size B, 5L OD : 4" 2 Grooves Pulley 2BK40H Outside diameter:4"~ 4.1" inch Length through bore: 1.1563" inch Belt section size: 5L , B, BX Material : Cast Iron Belt Top Width: 5/8" 2 Grooves One pulley B-Section Groove Outside Dia. 3.95"~4" Bushing H 2BK-H bushing V-Belt sheaves ( pulleys ) is an excellent choice for inch and metric shafts 2BK Sheaves are accurately machined from fine grained cast iron, statically balanced The belt series most common for this pulley is 5L, or B, BX, V-Belts.Keyway not included