New Stikit Gold Disc Rolls 216u A-weight 3m Marine 1438 Grade P220A 6" 175 : The 3M Stikit Gold Paper Disc Roll 216U is designed for convenience combining open coat aluminum oxide discs with a handy adhesive backing ready for quick and easy attachment to a Stikit backup pad sold separately. Our disc roll makes the discs easy to grab while eliminating the use of disc liners. The open coat feature provides a more aggressive cut than a comparable closed coat abrasive of the same grade and a special loading resistant coating makes this disc a good choice when loading is a problem. Slightly more aggressive than 214U.