5 in. Ceramic Blend Hook and Lock Sanding Disc 150 Grit Very Fine 15 pk Premium ceramic blend a superior quality formulation designed for fast material removal and long sanding life | Unique 12hole pattern provides a onesizefitsall design fits all 5 and 8hole sanders for fast and precise alignment | Premium hook and lock backing enables repeated attachment and removal of discs for a consistent secure connection | ClogSHIELD high performance separate coating that reduces pitch buildup and clogging for maximum productivity | ENDURABOND a specialized high strength resin provides superior grittobacking bond for extreme durability