Compact, high-impact-plastic base that can be clamped or even permanently mounted to a countertop or other work surface. Base dimensions: 6" x 2". Star-shaped holes in the base position the sharpener's fine ceramic rods at a 20-degree angle (10 degrees per side). The extra-long stones (12" length) are ideal for sharpening large knives and can be rotated to orient their edges to quickly sharpen serrated blades. They are also easily cleaned with ordinary household cleanser.