High-quality combined grinding stone with silicone non-slip pad and guide clamp with ceramic rollers. This helps to better maintain a constant inclination of the knife blade to the whetstone during sharpening. 2 grit levels: blue 1000 is intended for basic universal grinding, white 3000 for fine final honing and polishing. It is suitable for sharpening knives, scissors, woodworking tools and gardening tools. Without using a clamp, try to sharpen the blade at an angle of 15-20°. Before grinding, it is recommended to soak the stone in water for about 10 minutes. It is also advisable to moisten the stone during grinding. Allow to air dry after use and store. Material: corundum (stone), silicone (pad), ABS plastic, ceramic. Dimensions: the stone itself 18x6x3 cm, with a pad 18.5x6.5x3 cm, clamp length 10 cm. Do not use chemical products for cleaning.