For sale is a No.1 Quad Tapper built by Procunier for use on the Quad drill. Brass up to 1/4", cast iron up to 1/4" and steel up to 3/16". Has a 1/2" straight  shank. It appears to be in very good condition. Tested on drill press and reverse works. Selling as is so please refer to the photos for the condition of this item. Thanks for looking.