1 Wide Compatibility: RV double propane tank locking fits 1/2”-13 threaded posts, compatibility with most propane tank holders Theft Prevention: Safeguard your RV propane tanks with this lock kit, which securely attaches tanks to your vehicle, making it difficult for thieves to steal them High quality material: lock plate and wingnut plate made of high quality aluminum alloy, hard and durable, equipped with 304 stainless steel padlock, thicker and safer than the general lock New design: lock plate is with four-footed to reinforce for more secutity, RV gas tank lock kit is designed with 6 locking holes,-hole can lock safely dual dual propane tanks. service: If you have any questions about the product, please feel free to us, we promise to provide satisfactory solutions