Clarks Bottle Cage Bolts The Clarks Bottle Cage Bolts is used to attach to water bottle cages and holders onto the frame of your bike. These are strong and sturdy bolts that will fit all standard frames. Features: Fits in standard bike frames with standard M5 thread Includes 2 in each pack Length: 20mm Buy Clarks Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.