Complete the aesthetic of your cockpit to match the boxcar stem, and Paul Components disc brakes with this topcap designed to look like the pad adjuster for the Klamper mechanical disc brake caliper Adjusts the preload of your threadless headset and helps hold your stem on Modeled after the adjuster knobs on the Klamper Customize your cockpit with colorful options "Have A Nice Ride" etched on top Machined 6061 aluminum Includes A2 Stainless 6x30mm bolt Made in the USA Size: 1-1/8" Starnut sold separately Weight: 6g. (cap)