One side of the insert is an Oval cut and the other side is a Power Lift
Outside Diameter 31/32″: 0=9/16, 0.5=37/64, 1=19/32, 1.5=39/64, 2=5/8, 2.5=41/64, 3=21/32, 3.5=43/64, 4=11/16, 4.5=45/64, 5=23/32, 5.5=47/64, 6=3/4, 6.5=49/64, 7=25/32, 7.5=51/64, 8=13/16.
Outside Diameter 1-1/32″: 8.5=53/64, 9=27/32, 9.5=55/64, 10=7/8, 10.5=57/64, 11=29/32