RamRodz Pro-Series Micro Rile set features abrasive diamond coating for precise filing and durability. These versatile files are handy for general parts-fitting, as well as, removing material from spring/detent channels for lower receiver builds and deburring drilled holes. Each file is marked or color coded with the size. The smaller sizes are for deburring barrel threads, while the larger sizes for cleaning barrel porting. This 12-piece set includes .030" (2x), .040" (2x), .050", .060", .070", .080", .090", .100", .110" and .120" and comes in a premium-quality holster with magnetic clasp and a list of all replacement part numbers.