The Lansky Diamond/Ceramic 4-Rod Turn Box TB-2D2C is great for outdoorsmen that are on the go because it is lightweight and stores easily into a backpack. There are two pre-set knife sharpening angles in the wood block, 20 degree & 25 degree. The 25 degree is used for most kitchen knives and provides a sharp, durable edge. The 20 degree is used for those desiring a very sharp edge. Lower degrees result in sharper knives, but require more regular maintenance.