Constructed of alloy steel for a long, durable service life. Hardened to Rc: 56-60 for long service life and the best combination of accuracy, durability, and high-speed operation. Measurements are posted in the pictures. Please feel free to reach out with any questions you may have. I will do my best to answer your questions and can provide more pictures if need be. Priced low to sell fast. I have so much that I can’t keep up with posting it. Thank you for your interest and support.