This is a specific replacement part for pros and serious DIYers. The Ridgid 60935 is a Lock Nut and Adjustment kit designed for use with the KM-28 model (likely part of a faucet or valve repair system). It's a 1/2\ copper (sweat) x 3/8\ O.D. compression fit extension valve kit. Basically, it's a high-quality brass nut and hardware used to secure and adjust plumbing fittings, providing a reliable, leak-free connection. Manufactured in the United States, it's built to the sturdy standards you expect from the Ridgid brand. If you're repairing or maintaining a fixture that uses this specific part, this is the genuine component you need. Not a general-purpose nut, so make sure it matches your application before purchasing. Essential for keeping your plumbing in top shape.