Quad 4-N-1 insert combines 4 great styles, Power Oval, Perfect Oval, Round Mesh and Perfect Oval Mesh, into just one product. As an added plus, each Quad insert is designed with a patented Glue Groove to minimize excessive adhesive from seeping to the sur 19/32 through 13/16 have outside diameter of 31/32". 53/61 through 29/32 have outside diameter of 1-1/32".