Since the socket wrench set is a car trunk, I bought it for the house. There are many sockets used for bicycles at 12.7 corners, but with this product for 12.7, the hexagonal part becomes 19 mm, and for bicycles this size is not used. If it is 9.5 square it becomes 13 mm, which is also not used on a bicycle. The ratchet eyeglasses we possessed were 13-14, and the 4-size ratchet of MonotaRO which I purchased this time is 13-15 / 17-19, and this adapter can not be attached to 19, so on 13 mm side I purchased a 9.5 square one to use. When using 12.7 square socket, use the adapter. It is most suitable if 9 mm square is 14 mm and 12.7 mm is 17 mm. Even if it is attached to 13 of the same SK - 11 plate ratchet 13 - 14, because the thickness of the rotating part is 9.8 mm, the socket will not enter and it will not be locked. (It will come off when pulling by hand.) The 12 corners of the ratchet are scraped with a router, and it is adjusted to be locked.
Up to now I used 72 ratchet handles, but since it was broken, I saw the MonotaRO site. At first I was going to buy a handle but since there was not anything I wanted, I bought this product because I wanted to use it on the double mouth ratchet wrench of the house.
In the ratchet, even in a place where the head is large or does not enter or interfere, even if we use this adapter and combine the tools we were able to do the work. I think that it is such a product that "the hand reaches the itching place."