I've only used it for one project. Purchased from Leather craft.jp. I haven't used it much, as I mainly use a diamond awl. Please refrain from purchasing if you are concerned about minor imperfections. Purchased for around 2300 yen + shipping. These are European-style slanted punches, meticulously hand-finished one blade at a time, which are the mainstream type in Europe. They have been heat-treated and given a gray coating. By keeping the blade thickness and width consistent, the size of the holes won't change depending on the thickness of the leather. Because the holes on the front and back are the same size, needle passage is smooth, and work efficiency is improved. They are not suitable for thick leather, so instead of punching through the hole, use a round awl to cut through the leather.