This knife sharpener works great on all types of non-serrated knives. It is very easy to use on a number of knife?designs and is very sturdy and durable.?Directions?For scissors:?Use stage 1 by opening the scissors and inserting them into the slot. Steadily hold the sharpener and complete a smooth sharpening motion for 5-7 times.For steel knives:?Place the knife in stage 2 and sharpen 3-5 time, pulling towards you only. Repeat in stage 3 and 4 for a more defined finish.?Type:?Knife SharpenersMetal Type:?Diamond coated Tungsten steelSuitable for:?kitchen knives and scissorsSpecial Functions:?3 stages to get the best knife edge for your specific bladeBottom material:?Non-slip cushion bottomHandle material:?silicone