For machinists, toolmakers, or serious DIYers: this kimllier parallel set is all about precision. You get 9 pairs (18 pieces total) of steel parallels, each measuring 1/4 inch wide and 6 inches long. They're made from quality tool steel, hardened and ground to an accuracy of +/- 0.0002 inch in both parallelism and height - that's seriously precise. The size is laser-etched on each bar so you can easily identify them. Use them for setting up accurate clamping in milling, drilling, grinding, or assembly work. They keep your workpiece level and supported in a vise or fixture. Durable, reliable, and essential for any workshop where measurements matter. Comes as a full set ready to organize your tool cabinet.