Saker tool has three innovations:1. The wide roller design makes the grinding process more stable and the blade sharper.2. By adjusting the fixed angle, you get the desired blade angle.3. Upgraded off center roller, widely adapted to short chisels and planers.4. The body of the Saker honing guide is made of aluminum alloy, wear-resistant, corrosion-resistant. The off-center roller, widely adapted to short chisels and planers. The body of Smart Saker Honing Guide was made from aluminum alloy, heavy enough to support the weight of most chisels, wear-resistant, anti-corrosion, will never get rust after years of use. The Saker Honing Guide is a Perfect tool for easy and accurate sharpening. It only takes a few simple steps to attach your planer or chisel to the smart saker honing guide. Simple instructions are included with the package. Honing freehand may result in a rounded edge that doesn ft.t cut as smoothly. Since the Saker honing guide holds the tool at a fixed angle, it is easier to get a flat, consistent bevel and cleaner cuts. This guide is adjustable, it makes easy to dial in an exact bevel angle.