The Starrett A2E Quick-Hitch Arbor is designed for fast and tool-free hole saw changes. It is compatible with hole saws ranging from 32mm to 210mm, making it ideal for various drilling tasks. Equipped with a high-speed steel pilot drill, it ensures efficient and accurate drilling in different materials. Brand: Starrett Suitable holesaw sizes: 32mm - 210mm (1.1/4" - 8.9/32") Pilot drill: 6.35mm (1/4") high-speed steel Shank: 11mm (7/16") hex shank Screw thread: 5/8" - 18 Quick-Hitch feature: Allows for quick and easy hole saw changes without using tools Durable construction: Designed for heavy-duty use with bi-metal and carbide tipped hole saws