TSM-B2 is a stainless-steel ratchet base that is ideal for mounting your ALFA Tube series device on a 7/8″ or 1″ rail, either vertically or horizontally. It is perfect for use on boats, yachts, and other marine vessels, as well as in other harsh environments. The quick action handle makes it easy to raise and lower your device, and the ratchet ensures that your device is always in the correct position. This base is made of durable stainless steel, so it is corrosion-resistant and can withstand harsh marine environments. It is also easy to install, so you can have your device up and running in no time.