This is a winding check that connects the rear of the reel seat (outer diameter 27mm) and the carbon pipe rear grip,
such as Fuji ECS16, ACS16, RPTS16, RFBB16, RDEP16. (Refer to the example) It is used for the same purpose as the S-RSC, and the length is slightly shorter than that of the S-16RSC,
so it looks simple.
ID : 20.0mm / OD : 27.0mm/ LENGTH : 10.0mm