Item Descriptions: -Function: Provide effective protection for rear derailleur, prevent the derailleur was struck distortion or displacement in riding. -Arch Angle Design: Making the protector not easy to deform under strong impact force, which performs well in practical use. -Single Hole Fixing: 11mm hole diameter, just be fixed in the corresponding hole position, easy to assemble. -Wide Applications: Universal protection bracket fit for most folding bike, road bike, mountain bike. -Dimension: 10.5x5.5cm4.13x 2.16inch overall appearance size, 5.5mm0.21inch pipe diameter. Package: 2x Bicycle Rear Derailleur Guard Rack Protector (Note: Other accessories are not include.) Item Specifications: Colour:Black Hole Diameter:11mm Overall Size:10.5x5.5cm Pipe Diameter:5.5mm Material:Metal