2AK41-7/8"  2AK4178 

4" Cast Iron Pulley Sheave 7/8" Shaft Two Grooves V Belt A Section 4L 2AK41  OD:3.95" ID: 7/8"

Outside diameter: 4" inch ~ 3.95" Bore: 7/8" inch Belt section size: 4L, 3L 2 Grooves One pulley Hex set screws keyway