DZ Sales has end mill extension holders for sale, and we have a huge inventory to choose from. These high-quality machine tools are made from hardened alloy steel and are rated to 20,000 RPM. Our end mill holders will fit CAT50, CAT40, and BT40 machines. Upgrade the machine tools in your shop and machine with confidence and high precision. Having the right tools for your CNC machine will translate into tighter tolerances and better work pieces. We offer free shipping on select parts on all orders of $300 or more. Browse our huge selection of machine tools and holders today.