Check the listing for details. MADE IN USA Carbide Knife Makers Center marking Scribe Adjustable From 0-1”. Color: Black, Condition: New. Listed at 29.95 USD. Use the Jantz knifemaker's scribe to mark the center lines of a knife as a guide for grinding knife blades. This scribe is designed for accuracy and can be adjusted from zero to 1” The Jantz Centering Scribe helps knifemakers achieve precision and symmetry when grinding their knives, especially during the initial grinding By marking the center line on the blade’s spine, the maker has a guide for grinding to assure material is removed evenly from both sides of the blade for optimum symmetry and precision. Setting a visual guide is important to prevent over-grinding or uneven grinding that can weaken the blade. The visual guide also helps makers achieve a consistent edge thickness which is vital for balance, sharpness, and overall functionality of the blade. Using a centering scribe helps makers produce a higher quality knife through symmetry, consistency, and precision.