"Silicon carbide combination bench stones have both coarse and fine grit silicon carbide surfaces. These fast-cutting stones are used to sharpen edges on tools to moderate tolerances quickly. Dark grey in color. Stones are very fast cutting and while thin clear oil is usually sufficient, cutting may be tempered by soaking the stone in hot petroleum jelly.A Sharp Knife is predictable - It do not slip when it is drawn over the foods surface - It is easy to control - A Sharp Knife make a Nice Clean cut - Delicate ingredients look a lot fresher for a longer time if they have been sliced through cleanly - Preparing food is faster and more fun with a Sharp Knife - A Dull Knife slow you down and easily spoil the food.Suitable for sharpening and maintaining steel cutting edges; it produces durable, smooth-cutting edges and is preferred for close tolerances. The stone is prefilled with oil to save time and eliminate the need to presoak it prior to use. The oil prevents metal from bonding with the abrasive surface by flushing away dislodged abrasive and metal chips.Soak the whetstone in water for about 5 to 10 minutes or until only a little air bubbles appearing, that indicates the stone have absorbed the optimum amount of water necessary for best result. And keep applying water while sharpening. The reason for using the water is, the water makes the small stone particles released when honing, form an abrasive substance that gives the best sharpening result. Place the stone on a slip-resistant surface like a wet wiping piece or a wet dishcloth. If you're handy with woodwork you can make a wooden base, but a wet dishcloth will do just fine. Start with moving the blade, at an angle of 10 - 15°, back and forth (away from and towards the body) using the coarse side of the stone. Remember to apply water. Always start at the tip of the blade, only using light pressure, and pull the blade over the stone through the middle and down to the base of the blade. Repeat several times.Material: Silicone carbide,colour: As per availability,Dimension: 15 x 11 x 6 cm,weight with packing: 300 g "