- A/O Coarse (MH) 8AM Varied application options, for example: Rounding of edges, Fine grinding of implants, Weld dressing of intersections on turbine blades, Removal of processing traces on surgical instruments, Create matte surface finishes.H. POLINOX® convolute wheels consist of non-woven abrasive which is spiral-wound around a core and foamed up. This particular bond results in non-woven wheels with a very good surface finish, high stock removal rate and long service life.