2AK-20 5/8" Bore Solid Sheave Pulley with 2" OD , Hex set screws 2 Grooves for V-belts size 4L, 3L 2AK (OD 2"- ID 5/8") Outside diameter: 2" inch Bore: 5/8" inch Belt section size: 4L, 3L 2 Grooves One pulley Hex set screws Cast Iron Keyway : 3/16 X 3/32