Check the listing for details. Bicycle Headset Stem Top Cap 1-1/4" OD Glossy Surface with M6 Bolt Silver. Condition: New. Listed at 16.99 USD. This cycling headset top cap easily fits over most standard bicycle headset stems. The snug fit created by this specific sizing ensures the top cap stays firmly in place, providing excellent stability even during the most aggressive ride. Made of aluminum alloy, the cap is strong yet lightweight. It can withstand the rigors of daily use, from the shocks of rough terrain to the constant vibrations during long riding. This means you won't feel any drag or hindrance while riding, allowing you to maintain your speed and performance effortlessly. And M6 stainless steel bolt offer excellent corrosion resistance. This not only extends the lifespan of the bolt but also ensures that it remains securely fastened, keeping the top cover in place at all times.