This invention relates to bongdol . ; The invention of claim 1, the upper end ring is provided with a first bongdol equipped with metal ; ; equipped with a second ring at the lower end and a second bongdol equipped with metal ; And ; in the bongdol comprising a connection means for connection to each other or separating the first and second bongdol by the male screw and the female screw , ; The first and the second bongdol bongdol including that comprises the same or different size , ; the protrusion having a male thread on one of the first and second bongdol bongdol of a weight adjusting member of another washer -like weight is used for replacing the . ; Therefore, to improve the structure of bongdol easily adjust the weight balance of the crucifix of buoyancy and prevent another bongdol and water quality and fish stocks are dirty or being damaged by bongdol .
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