Fowler 52-483-777 Deburring Cutter Set, 4 Piece 4pc Deburring Cutter Set features four separate color coded cutters. Each color indicates the material that the cutter is intended for Full one year warranty offered by Fowler, an American company on materials and workmanship Colored sleeves rotate to lock and unlock blades for easy changing Unique rounded head blades for safe deburring of drilled and machined holes, end milled areas, tubing, backside of holes and an almost unlimited amount of uses Curved blades swivel freely to automatically follow shapes, contours and holes