🔵 Reusable Permanent Locking Rings ©™ are a hassle-free alternative to hex locks for sub day collars or other “forever” jewelry; 10mm outer diameter; thick and sturdy; they close flush!🚫 NO tiny keys🚫 NO springs🚫 NO tiny wrenches🚫 NO big-fingers-but-tiny-pieces headaches…. for our stainless...