Bonsai Air-layering Tool (Bonsai Bark Stripping Jin Tool) by Koyo
We originally thought this bonsai air-layering tool was designed for bark stripping to create jin (dead branches). Turns out it's for air-layering. However, we've tried it for bark stripping and it works!
It has two settings, one for thin branches and one for thicker branches, but you can adjust it easily to any size up to almost 2" (5cm). The overall length of the tool is 6 & 5/8" (approx 17cm). Made in Japan by Koyo tools.