By covering the flared base of the Shimano handle shaft, you can almost install Daiwa S-type knobs, which are exclusively for Daiwa. Since the flared base of the Shimano shaft is 5mm, a bearing with an inner diameter of 4mm cannot be installed. However, if left as is, there will be gaps and rattling will be a concern. By installing this adapter, the base flare increases from 5mm to 7mm, which is the same outer diameter as the bearing. After that, you can adjust the clearance with washers, etc. Compatible with Shimano bait reels (Aldebaran, Scorpion, Exsence, Calcutta Conquest, Antares, SLX, Stella, Vanquish, Twin Power, Complex, Vanford, Stradic, Exsence, Ultegra, etc.) and spinning reels, generally 1000 to 4000 size reels (※ The standard is that the handle knob shaft is 4mm thick). ・This is a new product made overseas, so there may be some rough edges or burrs. Please purchase only if you understand this. ※ We try to ship within 24 hours. ※ I am an individual seller, so I will ship with simple packaging. Thank you for your understanding.