R353 SANEI Nut Tightening Tool for Nut-Type One-Hole Mixing Faucets, Water Faucet Tool, Hexagon 46mm, Length 200mm, R353 Ordered on Amazon, arrived on October 9, 2025, and used for about 10 seconds on that day. Since I don't plan to use it again, would you be interested? This is a tool specifically for replacing kitchen faucets, and you can't remove the old faucet without it, so I think it's necessary for those who are replacing their faucets. The indentation on the back of the hexagon was there originally.