These are the center handle nuts for DRT Varial handles. DRT Varial handles doesn't come with the center nuts, and you have to pick one from this page to fit the handles to your reel. Please specify 7mm/8mm shaft size, Right/Left handle, and color. 7mm fits to 50-250 Shimano bait casters. 8mm fits to Daiwa/ABU and Shimano Conquest 300/400 models. Daiwa B1 SCR fits to Daiwa with hex head screw center nuts, for example Steez, Zillion TW, Tatula HD, Ryoga, Z2020