3M Hookit Microfinishing Film Disc 366L, 120 Mic 3MIL, Type D, 5 in x NH, Die 500X, 50/Pac, Case of 500

• Aluminum oxide abrasive offers a fast cut, long life, and professional performance on many surfaces
• Available in both open coat and dust control
• Durable polyester film backing enables close-tolerances and consistent finish
• Hookit hook and loop backing allows quick attachment and removal for multi-step finishing processes
• Load-resistant coating prevents dust and debris from clogging the disc

3M Hookit Microfinishing Film Disc 366L is rated Best in the 3M Microfinishing line of film backed discs. It features 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, fiberglass, paint prep, coating and corrosion removal, primer, e-coat, or metal.

We gave these discs a load resistant coating to increase efficiency and product life by minimizing loading. The abrasive is resin-bonded and supports disc flexibility without sacrificing durability and reliable performance under high heat and pressure. To complement the effective abrasive action, the polyester film backing flexes to help achieve a consistent finish over contours and offers greater tear-resistance than comparable paper products, making it ideal for high-production environments. And the 3M Hookit attachment and removal system holds the disc securely during use and provides easy disc change out. Designed for use with orbital and random orbital sanders, this disc comes in a range of grades for complete multi-step sanding and finishing.

Our 3M Hookit Microfinishing Film Disc 366L features precision, micron-graded aluminum oxide, which is a popular choice among industrial professionals because of its fast cut-rate and long life. This mineral makes a tough, durable abrasive that self-fractures to expose fresh cutting edges, whereas traditional natural abrasives dull more quickly. Due to its fast cut-rate, hardness, and strength, it is widely used in grinding applications in addition to sanding and finishing applications. Aluminum oxide is suitable for a wide variety of materials in both woodworking and metalworking, including ferrous alloys.

Whether the job requires a random orbital or rotary sander, buffer, grinder, drill, finishing sander or other power tool, hook-and-loop products allow the operator to focus more on the task and less on tooling. Abrasive products with hook-and-loop backing, including 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.

Our 3M sanding discs come in a variety of forms to fit various power tools and disc pads. Hook and Loop sanding discs are designed to be used with a random orbital sander, a handheld sanding machine that rotates the disc in a random pattern to prevent swirl marks from forming on the surface of the workpiece. The sander is fitted with a backup pad (sold separately) to which the sanding disc is attached. Hook-and-loop discs are quick and easy to change when switching from one grade to another, and can be reused again and again until worn out; whereas adhesive-backed discs are typically discarded after one use because the adhesive backing will not re-adhere a second time.

Trusted 3M Hookit Quality

The 3M Hookit Microfinishing Film Disc 366L offers professional-grade performance with its aluminum oxide abrasive. This fast-cutting, long-lasting abrasive is bonded to a durable polyester film backing, ensuring consistent results on many surfaces.

Designed for multi-step finishing, the Hookit hook and loop backing allows quick attachment and removal. This model, 366L, is part of 3M’s premium Microfinishing line, trusted by professionals for reliable sanding and finishing.

Precise 120 Micron Grade

This disc features a 120 Mic 3MIL grade, providing a fine abrasive suitable for detailed finishing tasks. The micron-graded aluminum oxide abrasive ensures a uniform finish while maintaining a fast cut rate.

Its precision makes it ideal for use on wood, composites, plastics, and metals. The 120 Mic grade balances material removal with surface smoothness, perfect for both rough and fine sanding steps.

Durable 5 Inch Size

The disc measures 5 inches in diameter, fitting standard orbital and random orbital sanders. This size offers versatility for various sanding applications, from small projects to larger surfaces.

Its polyester film backing provides tear resistance and flexibility, allowing the disc to conform to contours while maintaining durability. The 5 in size is common for many power tools, making it a practical choice.

Efficient Hookit Attachment System

The Hookit hook and loop backing system enables quick and secure disc changes. This feature reduces downtime during multi-step finishing processes and allows repeated use of the discs until worn out.

Compatible with backup pads sold separately, the system ensures the disc stays firmly in place during sanding. This model’s attachment technology supports efficient workflow on orbital sanders and other power tools.

Bulk Pack Convenience

This product comes in a pack of 50 discs, with 500 discs per case, ideal for high-production environments. Buying in bulk helps maintain a steady supply for continuous sanding operations.

The pack size supports cost-effective purchasing and reduces frequent reordering. The 50/Pac and 500 ea/Case quantities ensure you have enough discs for extended projects or multiple users.