Vise Grip Lady O/PO Grip Finger InsertsOne side of the insert is an Oval cut and the other side is a blended Power OvalDrill bit size required: 7/8The oval side provides the perfect natural feel for a smooth consistent release. The Power Oval side has a subtle 1/8″ forward pitch in a relaxed oval shape for added rotation.Vise P/S Inserts are available in 16 sizes and 7 colors.Sizes 17/32 through 3/4 have O.D. of 7/8″