The Turn Box Sharpener works well in the kitchen, as well as the outdoors, and it is lightweight and stores easily in a kitchen drawer or backpack. It only takes a few swipes to maintain an edge. There are two pre-set knife sharpening angles in the wood block, 20 degrees & 25 degrees. 25 Degrees - This is used for most kitchen knives and provides a sharp, durable edge. 20 Degrees - This is used for those desiring a very sharp edge. This 2-Stage Knife Sharpening System features a hardwood turn box with internal rod storage in the base, and four 5" long alumina ceramic rods. (2 medium 600 grit grey rods, 2 fine 1000 grit white rods).