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 surface. Quad 2"s have Size Increments of 1/32" Size Increments are 1/64" - Standard O.D. of 31/32" -for sizes 19/32" thru 13/16" - Larger O.D. of 53/64" -for sizes 29/32" thru 1-1/32"