The Dodge F2B-DL-104S is a flange-mount ball bearing unit housed in cast iron for reliable durability. The F2B-DL-104S features a two-bolt flange mounting tpe and a concentric collar locking device. Like the other 206 series units, this one mets standards: UL, AFBMA, AGMA, ASMMA, BSA, CMA, MPTA, and PTDA!