Industry Nine Headset Top Cap Kit Top of The Cap to You The top cap is what keeps your headset, fork, frame, and stem together. It goes on top of your steerer tube and can add a splash of color to your ride. The Industry Nine Headset Top Cap Kit comes in numerous colors so you can match your style. The kit comes with a top cap in whatever color you want and a top cap bolt. This kit is designed for 1-1/8" steerer tubes. Features Kit includes: one top cap and one top cap bolt Designed for 1-1/8" steerer tubes Comes in numerous colors to match your style | Industry Nine | Headset Top Cap Kit Black