1VP50-7/8" Bore Variable Pitch Sheave Adjustable Pulley 1VP5078 One Groove Hex set screws for V-belts size 4L, 3L 1VP5078 (OD: 4.75"- ID: 7/8") Outside diameter: 4.75" inch Bore: 7/8" inch Adjustable Pulley Belt section size: 4L, 3L One Groove One pulley Hex set screws Cast Iron 1VP5078 Keyway