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SKU 7100015071
Legacy SKU 60020007476
UPC 00051144841622
Product Number 366L

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.

  • Aluminum oxide abrasive offers a fast cut, long life, and professional performance on many surfaces
  • 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
  • Available in both open coat and dust control
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On it's way to you September 29   


Minimum Order 500 Items
Order Increment 500 Items
  High-Quality Surface Finishes
  Reduces Abrasive Costs
  Long Lasting Performance
  Fantastic Price
Product Dimensions
Imperial Metric
Diameter 5 in 127 mm
Shipping Dimensions
Weight 5.713 lb
Length 12 in
Width 12 in
Height 7 in
Color Orange
Maximum RPM 12,000
Grit Non Pertinent


  1. What is the 3M™ Hookit™ Microfinishing Film Disc 366L used for?

    The 3M™ Hookit™ Microfinishing Film Disc 366L is used for finishing and polishing tasks such as paint, clear coat sanding, topcoat refining, or anywhere else where consistent finishes are desired.

  2. What is the size of the disc?

    The size of the disc is 5 inches in diameter.

  3. How many pieces does each case contain?

    Each case contains 500 pieces.

  4. What does NH and Die 500X mean?

    NH means "no holes" which indicates that this pad has no dust collection holes. Die indicates that it can be used on die grinder tool attachments. This pad also uses a hook-it attachment system designed to work with various back up pads and aren't limited to one brand.

  5. Is there anything unique about these discs compared to other options available in the market?

    : Yes - patented aluminum oxide abrasive particles present on these discs provide faster cut rates thereby requiring fewer steps to achieve a perfect finish,resulting in better productivity and an extended lifespan before replacement.While their anti-loading properties ensure aggressive performance throughout its lifetime thus making them a lucrative option over traditional abrasives.

For industrial/occupational use only. Not for consumer sale or use.
3M industrial and occupational products are intended, labeled, and packaged for sale to trained industrial and occupational customers for workplace use.  Unless specifically stated otherwise on the applicable product packaging or literature, these products are not intended, labeled, or packaged for sale to or use by consumers (e.g., for home, personal, primary or secondary school, recreational/sporting, or other uses not described in the applicable product packaging or literature), and must be selected and used in compliance with applicable health and safety regulations and standards (e.g., U.S. OSHA, ANSI), as well as all product literature, user instructions, warnings, and other limitations, and the user must take any action required under any recall, field action, or other product use notice.  Misuse of 3M industrial and occupational products may result in injury, sickness, death, or property damage.  For help with product selection and use, consult your on-site safety professional, industrial hygienist, or other subject matter expert.
The 3M™ Hookit™ Microfinishing Film Disc 366L

The 3M™ Hookit™ Microfinishing Film Disc 366L is a high-quality abrasive product designed for use with orbital and random orbital sanders. It 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.

These discs feature 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.

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.

3M Sanding Discs

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.

  • Load resistant coating to increase efficiency and product life
  • Resin-bonded abrasive supports disc flexibility without sacrificing durability
  • Polyester film backing flexes to help achieve a consistent finish over contours
  • Greater tear-resistance than comparable paper products
  • 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
  • Comes in a range of grades for complete multi-step sanding and finishing
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