This is a dust cap for the oil disc exhaust screw and a rubber sleeve for the oil filler nozzle suitable for mountain and road bicycles. It is also a repair part for the XT caliper. The specification is that one set includes one of each different style, which can well fit the oil disc systems of various mountain and road bicycles and the XT caliper. These dust caps and rubber sleeves can effectively prevent dust, debris, etc. from entering the oil disc exhaust screw and the oil filler nozzle, avoiding the impact on the normal performance and service life of the oil disc due to the entry of impurities, and ensuring the stability and reliability of the bicycle braking system. For users who need to maintain and repair the bicycle oil disc, it is a practical accessory choice, which can provide a safer guarantee for cycling. Whether it is an ordinary cycling enthusiast or a professional bicycle maintenance personnel, they can use this product to improve the performance and usage experience of the bicycle.