Prum Material: Made of strength aluminum alloy for a strong, wearresistant, and longlasting tool. Extended Roller Design: Longer roller provides greater stability during backandforth movement, helping keep the process smooth. The grinding stone experiences less wear, and the roller maintains the correct sharpening angle throughout use. Adjustable Sharpening Angle: A measuring scale lets you set the grinding angle by adjusting the length of the clamped object and fixing the angle against the scale, making it easy to achieve a standard angle for different applications. Adjustable Clamping: The opening size and clamping range are controlled by the hand screw nut, covering commonly used sizes. The threepoint clamping design prevents wobble, yields a firmer clamp for accessories, and makes the tool compatible with a wider variety of tool types. Practical applications: Sharpen woodworking chisels, plane blades, and carving gouges with a consistent angle. Resharpen knives and garden tools to maintain a precise edge. Service a range of other tool types thanks to adjustable opening and stable threepoint clamping.