why do you know it is a good abrasive disc?

Some characteristics that can make an abrasive disc good include:

1. Durability: A good abrasive disc should be able to withstand heavy use without breaking or wearing out too quickly.

2. Abrasive grain quality: The abrasive grains on the disc should be evenly distributed and of good quality, allowing for consistent and efficient material removal.

3. Versatility: A good abrasive disc will work on a variety of different materials, such as metal, wood, or plastic.

4. Heat resistance: The disc should be able to withstand heat generated from friction during sanding without becoming too hot and losing its effectiveness.

5. Easy to attach: The disc should be easy to attach to the power tool, allowing for quick and efficient changes when necessary.

6. Cost-effective: A good abrasive disc should provide good value for its cost.