Shop for Lighting & Fans at The Home Depot. Replace old or broken knob switches on your light fixtures with the Westinghouse Black Finish Replacement Knobs. Their black finish and simple design easily match many common floor and table fixtures. These 2 knobs are tapped 4/36-F and come with 1/2 in. extensions that are tapped 4/36-M, allowing for versatility in installation and usage. Westinghouse is a global brand with a simple philosophy: make life easier for everyone who buys its products. The company offers ceiling fans, lighting fixtures, lighting hardware, lighting accessories, and light bulbs for both consumer and commercial applications. Westinghouse products are designed for exceptional quality, reliability, and innovation. Product reference number 70161.