This is a tool that can be hidden inside the crankshaft, which can be with you all the time. When you need it, you can have it right away. Which uses high-quality steel shaft Neodymium magnet adsorbed above, to prevent loss during cycling. It is compatible with most steel shaft sprocket wheels on the market. Compatible with: M985 M980 M970 M9020 M9000 M8000 M7000 M6000 M820 M590 M591 M660 M610 M612 M615 M627 M640 M670 M675 M770 M780 M785 Colour: Black Material: Aluminum alloy Package Contents:1*Bicycle Repair Tool Only the above package content, other products are not included. Note: Light 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.