It is a genuine manufacturer-approved replacement switch which is specially produced for use with Craftsman and Skil circular saws. It is the part of the tool handling on/off operations, but over time components may wear out and begin to fail, eventually requiring a replacement. Keep in mind this high-quality plastic body switch is sold individually.
This item has been sourced from the original manufacturer and is intended to be used with circular saws from Skil and Bosch. The retaining ring is used to secure the lower blade and to provide spacing for the spindle. This item is available as an individual replacement part.