Whether you're grinding tool steel, aluminum or anything in between, Weiler RFDs deliver the options you need to get the job done right and fast.When an aggressive cut rate and smooth finish are a must, metal fabricators turn to a resin fiber disc RFD..Coated Abrasive Disc, Fast Cut High Performance Long Life Performance Line, 5 in Diameter Disc, 7/8 With premium grain mixes that aggressively remove metal and a superior design that locks the grain in, Weiler Tiger and Wolverine RFDs are designed to deliver serious grinding solutions.