Big Horns angle checker gives a quick reading of eight standard sharpening angles. 15-degrees for knives and carving tools; 20-degrees, 25-degrees, and 30-degrees for chisels, plane blades and gouges; 35-degrees for heavy duty mortise chisels and gouges; 45-degrees for axes and turning parting tools; 50-degrees for turning gouges; 70-degrees for turning scrapers. 2-Inch(51mm) diameter. Made of solid brass with engraved angle degree markings and hole for hanging on key chain or a nail by your sharpening bench.