Diablo DCT318ASTH12G 3-1/8'' Triangle Sanding Sheets w/Hook Lock, 12-pcs/Box BRAND NEW AND COMPLETE! THE PACKAGE WAS OPENED AND INSPECTED. Diablo's premium detail triangle sanding sheets with Hook Lock backing include break-through innovations that improve performance, extend sanding life and increase productivity. Featuring a premium ceramic blend, these discs remove material faster and offer extra-long sanding life than other sanding discs. Clog-SHIELD, Diablo's own blend of grinding agents, reduces loading thus maximizing productivity. The superior grain bonding system, ENDURA-BOND, provides Diablo's sanding discs with longer life and extreme durability. ? Premium Hook Lock backing for a consistent secure connection ? Clog-Shield reduces pitch build-up and clogging ? Endura-Bond provides superior grit to backing bond for extreme durability ? Premium ceramic grain blend for fast material removal and extra-long sanding life ? Maximum performance in leveling and heavy stock or paint removal