Lockable connecting ring

A lockable connecting ring, comprising:

• a first assembly and a second assembly, and the first assembly is connected to the second assembly to form a ring body,
• wherein the first assembly comprises a first rod body, wherein two opposite ends of the first rod body have a male linking portion and a female lockable portion, respectively;
• wherein the second assembly comprises a second rod body, wherein two opposite ends of the second rod body have a male lockable portion and a female linking portion, respectively;
• wherein the male linking portion of the first assembly is pivotally connected to the female linking portion of the second assembly;
• and the female lockable portion of the first assembly is detachably connected to the male lockable portion of the second assembly by screwing;
• wherein the female lockable portion has a first hole, the male lockable portion has a second hole;
• the second hole is overlapped with the first hole, and a fastener detachably passes through the first hole and the second hole, the fastener has a rod;
• wherein the first hole has an annular flange protruding inwardly, an outer circumference of the rod of the fastener has an annular groove;
• a stopper slidably fits around the annular groove;
• the stopper is located in the first hole;
• an outer diameter of the stopper is greater than an inner diameter of the annular flange, and the outer diameter of the stopper is greater than a diameter of the second hole.