I accidentally bought two, so I'm selling this one. It's a hose cutter & insert press-in tool for road bikes. I use one myself, and it's very easy to use. The aluminum body makes it easier to apply force, improving work efficiency. Here's an excerpt from Amazon customer reviews: The cutter's sharpness is outstanding, and it's praised for being able to cut at the desired position. Users also seem satisfied with its ease of use and handling. The cutter's sharp cutting ability and the ability to cut straight and insert straight are also well-regarded. Many users have reported that it worked without any problems. They say that work efficiency has improved and there are no issues with the work. There are also opinions that the adapter was successfully pressed in.