These are the center nuts for Livre handles. 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 scenter crews, for example Steez, Zillion TW, Tatula HD, Ryoga, Z2020. These nuts also fit to DRT handles. CBF nuts are machined more to remove weight.