AK20-1/2" OD 2" Cast Iron ID 1/2" Shaft Pulley Sheave Single Groove V Style A Belt 4L New AK2012 AK20 1/2" Bore Cast Iron Pulley - Keyway for V-belt size 3L, 4L, A B OD 2" ID 1/2" Outside diameter: 2" inch Length through bore: 1.1563" inch Bore: 1/2" inch Belt section size: 3L, 4L Material : Cast Iron Quantity : One pulley 2 Hex set screw 90 Keyway : None