Durable construction: constructed from wearresistant nylon and a corundum grinding wheel, this drill bit sharpener provides longlasting strength for sharpening tasks. Compatible with iron drill bits: specifically designed for iron drill bits, it helps you get more use out of your bits, extending life and improving performance. Hexagonal shank design: features a 35 mm (1/4 inch) hexagonal shank diameter, compatible with electric and pneumatic screwdrivers and other tools. Portable and practical: compact and easy to carry and store, making it suitable for both DIY enthusiasts and professionals. Use scenarios: In a metalworking , refurbish dull iron drill bits to restore cutting performance. On a construction site or fabrication project, perform quick drillbit maintenance to keep work flowing. For home DIY projects involving metal drilling, maintain reliable bits for consistent results.