How to Install:1. To Install the brake to the bike first (Holes correspond to holes).2. The brake cables pass brake wire tube and fix the position of wire tube3. Fix the brake line on the bolt.and install the brake caps to adjust the length and distance and position of the brake tube.4. Fix the brake line well.Package includes:2 pairs aluminium alloy bike brakes4 x pieces cable end caps1 x pieces front brake cables: 29inch (75CM)1 x pieces rear brake cables:68.8inch (175CM)Product Size::The brake arm : 5.1 inchesThe brake pad : 2.3 inchesNote:The bike brakes set is Suitable for most mountain bikes and road bikes. Please kindly confirm if the back wheels of your bike has the hole for the bike brake before you order it. if you have any question please contact customer service in time and you will get a satisfactory result.