The 3M™ Hookit™ Microfinishing Film Disc 366L features a premium, micron-graded aluminum oxide abrasive bonded to a durable polyester film backing to produce a fast cut rate and uniform finish on wood, solid surface composites, plastic, fibreglass, paint prep, coating and corrosion removal, primer, e-coat, or metal.The 3M Microfinishing Film Disc 366L features a precision, micron-graded, resin-bonded, polyester film backing. It is designed to have an aggressive cut with uniform finish. It also has an anti-load coating that helps provide greater efficiency and longer product life. 3M Hookit Products are manufactured with loop material that attaches to a backup pad (sold separately) where tiny hooks firmly engage the loops. Attachment is quick, easy, and secure during use. Sanding, finishing, and surface conditioning products with the hook-and-loop attachment and removal system provide an efficient way to work through multi-step finishing processes and can be used again and again for the life of the abrasive.