Milwaukee 48-66-3160 Chuck Key for Chucks 48-66-2000, 48-66-2040, 48-66-2080, and 48-66-2085 The product is easy to use The product is durable The product is manufactured in Taiwan For use with chucks 48-66-2000, 48-66-2040, 48-66-2080 and 48-66-2085 Use with key holder 48-66-4020