CRKT - Veff Sharp Portable Multi-Purpose Field and Bench Sharpener. Model: CRVEFF1. The system includes a black anodized knurled aluminum handle and two threaded 600-grit diamond-coated sharpening rods. The smaller rod has three 2 straight sections in sizes 3/32", 3/16", and 1/4". The larger rod has three straight sections in sizes 11/32", 1/2" and 5/8". The larger rod also has a 6" flat side. The handle and rods store neatly in black nylon storage pouch. Effective on most serrations. Also works on guthook knives, seat belt cutters, plain edge knives, wood chisels, wood carving and lathe tools, router bits, punches, scissors and saw chain. Designed by Tom Veff."