You are looking at one Pro-tek CNC billet Rear Brake Fluid Master Cylinder Reservoir Cap in brite-dipped anodized finish that replaces the stock plastic cap on the rear brake reservoir.This reservoir cap is CNC made from 6061 T6 billet aluminum, is brand new still in original packaging, manufactured in the USA, and comes complete with manufacturer warranty.This round threaded rear brake cap (Pro-tek Part No. RC-100) is 2.25" x .50" and has the word Pro-tek engraved on it twice.These are not cast aluminum caps machined later to look like billet (made in China) that are all over the Internet. These are American made from solid billet aluminum, 100% CNC machined from a name you can trust - Pro-tek - a leader in the motorcycle industry for over 25 years.Applications:1995-2000 Honda Goldwing 1500 GL15002001-2017 Honda Goldwing 1800 GL1800