These bike professional screw covers are designed to your bicycle's hydraulic brake system. Made durable plastic, they effectively shield the brake bleeder screws and debris, ensuring optimal performance. Ideal for both casual riders and professional cyclists, these covers help maintain the longevity of your bike's braking system. Features -Color:Red -Material:Plastic -Size:1.90X0.65X0.65cm/0.75X0.26X0.26in - and water resistant: effectively prevents , water, and other impurities entering the bike's oil disc bleed screw cap, extending the lifespan of components -Easy to use: simply install on the oil disc bleed screw cap to provide and water protection, making bike maintenance convenient for users -Durable and reliable: made plastic material, it resistant to wear and tear, ensuring longterm use without deformation or aging -Versatile application: suitable for various types of bicycles, including mountain bikes and road bikes, and can be used in outdoor riding and racing scenarios -great fit design: carefully designed dimensions and shape ensure a great fit on the bike's oil disc bleed screw cap, preventing it falling off and providing better protection Package list: 20PCS x bicycle cover