PREMIUM MATERIAL - This 5c collet block set is made of superior high-speed steel. After advanced quenching technology, these collet blocks have excellent wear resistance, high hardness and high precision EASY OPERATION - Due to the high precision, these 5c collet blocks are easy to quickly set up on milling machines, lathes, surface grinders and drilling machines, providing you with a simple operation experience PROFESSIONAL TOOLS - These collet blocks are effective tools for machining parallel, square or hex shapes as well as cross hole drilling at 60°, 90° or 120°. Accuracy of parallelism, squareness and flatness within ± 0.0005? COMPLETE SET - You will get a professional and complete collet block set, including 1 piece of hex collet block, 1 piece of square collet block, 1 piece of quick clamping handle and 2 pieces of quick-acting rings. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions., Weight: 3.67951515278 pounds, Manufacturer: KEILEOHO