mount hidden is specially designed for bicycles with front fork holes(Note: is not included ). After the mount is installed on the hole of the bicycle front fork, will notice that there is an hidden inside except you. This effectively prevents the bike from being stolen and lost. mount hidden can perfectly protect the from water and dust. Made of high-quality aluminum alloy and plastic material, the shell is strong and durable. The expansion plug design makes the mount perfectly fit your bicycle's front fork hole, after being installed on the bike, the will not fall off even in bumpy riding. tip: without Material: Aluminum alloy + plastic colour: black Package Contents: 1 x bike front fork down tube stand kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.