The A.D. International Micro Fine Drill Adaptor is a versatile tool that allows you to securely mount miniature drill chucks with a 0-1/8 inch or 0-3 mm capacity onto larger power tools. Its keyless JT0 taper design provides a secure and stable connection, ensuring precise and controlled drilling or milling operations. This adaptor is perfect for intricate work on small parts, jewelry making, model building, and other delicate tasks requiring exceptional precision. With its compact size and sturdy construction, it offers convenience and reliability for your micro-drilling needs.