The Blademedic Pocket Sharpener is first aid for your blade: the first responder for field repairs on all types of knife blades. It's like having an entire knife sharpening system right in your pocket - able to tackle regular or serrated blades, guthooks, hunting, fishing, - just about any knife using one or all of the following elements:Tungsten Carbide - Just three or four strokes will restore your blade. Ceramic Sharpening Rods- 1,000 grit - Polish to a finished edge in three or four strokes. Serrated Knife Sharpener- 800 grit - Designed to get inside even the smallest serrations.Diamond Tapered Rod- 600 grit - For fast reconditioning and maintenance of both straight and serrated blades. Excellent for guthooks.Sharpening angles are pre-set at 22.5Adeg to achieve a 45Adeg inclusive angle.Dimensions: 3.9" x 1.25"