For Mountfield 1125M, 1436H, 1436M, 1540H, 1636H, 3600SH, 4000SH, 4200H, T35M, Ride On Mowers. OD = 63mm. Pulley has a centre bearing incorporated into its design. This item is brought to you courtesy of JAPG MOWERS AND MACHINERY, based in Herefordshire in the UK.