3M™ Cubitron™ II 967A Flap Disc capitalizes on our proprietary 3M Precision Shaped Ceramic Grain technology to deliver superior cut rates, while the flexibility of the flap construction enables grinding and blending in a single step. Because our 3M Precision Shaped Ceramic Grain generates an exceptionally high cut rate with less pressure, operators can finish tough tasks like weld grinding, deburring, rust removal, edge grinding, weld seam blending and deburring faster with less fatigue. A heat activated grinding aid on the disc helps keep the disc cooler on stainless steel and other heat sensitive metals such as nickel alloys and titanium, thereby reducing metal discolouration/oxidation and the chance of heat related stress cracks. The superior performance and durability of 3M Precision Shaped Ceramic Grain is enhanced by a uniquely designed heavy Y weight poly cotton backing that enables controlled, even wear with no premature dulling or glazing, so operators can accomplish more throughput per disc. For Quick Change, 11.43 cm flap discs with a center hole require a flap disc adapter nut and 17.78 cm discs require a flap disc holder (both sold separately). Discs with a 11.43 cm diameter have a max RPM of 13,300 and 17.78 cm discs have a max RPM of 8,600. Use Type 27 on flat surfaces or outside edgework. 3M™ Cubitron™ II Brand Products have raised the bar for high performing abrasives. 3M Precision Shaped Ceramic Grain out cuts and outlasts conventional ceramic industrial abrasives and requires less grinding force to achieve superior performance.