Purpose: Ideal for precision work, allowing for parallel mounting of workpieces on machines, vices, marking plates, or machine tools. Precision Ground: Achieved to a very high standard of 0.01 mm for accurate placement. Thickness: Each plate measures 3 mm for consistent height. Length: 150 mm for versatile use. Plate Sizes: 2 pcs. at 8 mm 2 pcs. at 13 mm 2 pcs. at 16 mm 2 pcs. at 19 mm 2 pcs. at 22 mm 2 pcs. at 25 mm 2 pcs. at 31 mm 2 pcs. at 35 mm 2 pcs. at 38 mm 2 pcs. at 41 mm This comprehensive kit ensures you have the right sizes for various applications.