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This handy blade grind tool is a must for calculating the perfect blade grind height for a given steel thickness. This blade grind slide rule designed to help you estimate the height of your hollow grinds when planning your next blade. It will help you figure the height in inches and mm/cm. It works for the most common steel thicknesses. It also includes an educational chart on the reverse side which breaks down the most popular steels into their component alloy ratios. This blade grind slide rule is a must-have tool for all knife makers, especially those aspiring to be well versed in their understanding of steels and double-convex (hollow) grind estimations.