SANEI water faucet tool, a nut tightening tool for bolt-type one-hole mixing faucets, model R356, for hexagonal flats of 13mm. I purchased this to DIY replace a KVK one-hole mixing faucet with a Lixil one-hole mixing faucet with a shower, but it was a speed nut type, so I didn't use it. If you need it, please consider purchasing it. My faucet was KVK, but SANEI also makes a tool for hexagonal flats of 13mm. As shown in the attached diagram, I decided to purchase SANEI because it is smaller and easier to work with in a narrow kitchen space. SANEI Model R356 KVK Model G30 ------------------- ※※Also listed on other flea market apps. ※※The purchase will be determined by the earliest date and time. Please understand that there may be cancellations. ------------------- #SANEI #R356 KVK #G30 #FaucetTool #HexagonalFlat13mm