Draper Whetstone Sharpening Stone Set Non-Slip Base & Angle Guide,This set has two dual sided whetstone sharpening stones 400 1000 grit for quickly sharpening dull knives and a finer 3000 8000 grit. It is made from high quality white corundum. The silicone non slip base ensures the stones stays in place while sharpening. The angle guide helps to control the angle and provides extra safety. The set also includes a leather strap for polishing and eliminating burrs and a stone fixer for removing dirt and worn layers.