8milelake Upgraded Fixed-angle Knife Sharpener Kit Full Metal Professional 4 Sharpening Stones Full Metal , durable to use. Simple operation, quick and easy to sharpen knives. Big sharpening degrees: 5-90, more flexible to use. Dedicated knife sharpening kits come with four high-quality sharpening stones, 120#, 320#, 600#, 1500#, meeting your different needs. After grinding, knives can be very sharp and do not have any rough grinding crack.