These are the center handle nuts for DRT Varial handle 140-150 only. 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