2AK41-1" Bore Solid Sheave Pulley with 3.95" OD Double Grooves for V-belts size 4L, A, AX, 2AK411 (Pulley OD 4"- H :ID 1") 4" Cast Iron Pulley Sheave 1" Shaft Two Grooves V Belt A Section 4L 2AK41 3.95" Outside diameter: 4" inch ~ 3.95" Bore : 1" inch Belt section size: 4L, 3L 2 Groove One pulley Hex set screws keyway