AK46-7/8" Bore Solid Sheave Pulley with 4.45" OD One Groove AK4678 4.45" Cast Iron Pulley Sheave 7/8" Shaft One Grooves V Belt A Section 4L AK46 4.45" AK4678 Outside diameter: 4.45" inch Bore : 7/8" inch Belt section size: 4L, 3L One Groove One pulley Hex set screws keyway AK46-7/8" V-Belt sheaves is an excellent choice for inch and metric shafts. AK Sheaves are accurately machined from fine grained cast iron, statically balanced, painted and individually packaged. The belt series most common for this pulley is 4L, or A , AX, V-Belts.