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2BK-23 1/2" Bore Solid Sheave Pulley with 2-1/4" OD , Hex set screws for V-belts size 4L, 5L 2BK20-1/2" Rubber V Belt 1VP34-3/4" Bore Variable Pitch Sheave2BK 23 1 2" Bore Solid Sheave Pulley with 2 1 4" (2. 25") OD , Hex set screws for V belts size 4L, 5L 2BK23 1 2" Outside diameter: 2 1 4" inch (2. 25") Bore: 1 2" inch Belt section size: 4L, 5L 2 Grooves One pulley Hex set screws Cast Iron keyway