2AK124 1-1/4" Bore OD 12.30", 2 Grooves V-Belt Sheave Pulley Gear 2AK124-1 1/4" Cast Iron for 3L . 4L A - V belt V-belt size A , AX , 3L Outside diameter: 12.30" , 12.5 inch Length through bore: 1.1563" inch Bore: 1-1/4" inch Belt section size: 3L, 4L , Material : Cast Iron One pulley 2 Hex set screw Keyway 1/4" x 1/8"