Back in the days of 35mm film, a 50mm prime was considered a 'standard' lens. That's because it gives pretty much the same perspective as viewing a scene with the human eye, without the magnification of a telephoto lens or the shrinkage a wide-angle lens uses to squeeze more into the frame.
The flexi disc (also known as a phonosheet or Soundsheet, a trademark) is a phonograph record made of a thin, flexible vinyl sheet with a molded-in spiral stylus groove, and is designed to be playable on a normal phonograph turntable.
Flap Discs consist of sanding strips on a strong polyester backing that are bonded to a fiberglass backing plate in an overlapping circular pattern. With this process, a new layer of the sanding strip is exposed as each previous layer wears away, resulting in a consistent cut rate all through the life of the flap disc. With just one of these flap discs, you can complete material removal and finishing in ONE process. Flap Discs are an essential tool for right angle metal grinding applications, and can be used in place of using both grinding wheels and fiber discs. Sort by: Featured Items Newest Items Bestselling Alphabetical: A to Z Alphabetical: Z to A Avg.