Nylon or PTFE bushings for use with any #7 Ace-Thred. Solid bushings are not stoppers (see 5803,5846) but are intended for drilling custom diameter holes. Ferrule designed bushings can be used with either 11710-03 PTFE ferrule for 1/8 inch OD tubes, code -05 for 3/16 inch OD tubes or code -07 for 1/4 inch OD tubes.