Everything is in this clamp has been handmade by a tsukamaki-shi, including the screws, and incoporates the best features of several clamps made and used by Japanese tsukamaki-shi. There are, for example, adjustments for hand size and tension. 

Each clamp is numbered, and comes in a leather bag inside a kiribako. Each clamp is guaranteed for life. If it ever needs repair, the maker will repair it.