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. Same great style and versatility as our original Quad 4-N-1 insert, except the Ms. version has a 7/8" outside diameter.