3M™ Hookit™ Microfinishing Film Disc 268L, 9 Mic 3MIL, Type D, 6 in x NH, Die 600Z. 3M™ Hookit™ Microfinishing Film Disc 268L is a fast-cutting abrasive for precise, uniform, close-tolerance finishes. An aluminum oxide mineral is resin-bonded to a 3 MIL, high-strength polyester film backing for durability. This disc is ideal for defect repair and leveling, paint prep and final finishing.