This professional-grade angle block set is exactly what machinists and metalworkers need for precise angle measurements! The set includes 12 individual steel blocks covering the most commonly used angles: 1/4°, 1/2°, 1°, 2°, 3°, 4°, 5°, 10°, 15°, 20°, 25°, and 30°. Each block is made from 0.25-inch thick hardened steel that's been precision ground to an accuracy of +/- 20 seconds - that's serious precision for professional work. The light magnetization helps the blocks stay in place during setup, making your work more efficient and accurate. The hard carrying case keeps your blocks organized and protected from damage or contaminants when not in use. Perfect for setting up milling machine angles, calibrating measuring equipment, or any situation where precise angle configurations are crucial. The workshop-grade quality means these aren't hobbyist tools - they're built for daily use in professional environments. The grinding accuracy of 0.0000mm per inch ensures your measurements will be consistently reliable project after project. Whether you're working in manufacturing, tool and die making, or precision machining, this set delivers the accuracy professionals demand. Much better than trying to eyeball angles or use less precise methods - these blocks give you confidence that your angles are exactly right every time. This is one of those tool investments that pays for itself through improved accuracy and time saved on setups.