Vermont American 17108 1/4-Inch to 1/2-Inch Drill Chuck Arbor Adaptor This item is Vermont American 17108 1/4-Inch to 1/2-Inch Drill Chuck Arbor Adaptor Used for Handtools & Tool Organizers, Other Hand Tools The produt is manufactured in United States Drill chuck arbor with 1/4-Inch shank and 1/2-Inch threaded arbor Holds all 1/2-Inch bore grinding wheels Holds all 1/2-Inch bore wire and buffing wheels