Commando Diamond Knife, Fishhook and Utility Sharpener with Retractable Medium Grit Diamond Stone in Attractive Blue Anodized Handle for Fishing, Hunting, Home or Industrial Applications Quality Fine Medium Diamond Coated sharpening stone length 2-1/2" Pen size 7/16" x 5-1/2" closed (8" Open) with attractive 3/8" diameter anodized aluminum body Built-in chuck positions & firmly holds sharpening stone. USA made Handle complete with pocket clip Simply loosen chuck nut to remove & replace quality diamond coated sharpening stone Limited Lifetime Warranty on USA Made handle & 1 Yr Limited Warranty on tools - see warranty details