Features and Benefits:?For use with chucks 48-66-0070, 48-66-0104 and 48-66-0230?Use with key holder 48-66-4080.?Great value?Easy replacementThis chuck key tightens the jaws of the 1/4 in. capacity chuck 48-66-0070, 48-66-0104 and 48-66-0230. Key holder 48-66-4080 should be used to attach this chuck key to the cord set.