For use with Fly Tie Thin-Hard Formula only, Solarez's other formulas will be too thick for this tip applicator.4oz bottle (24/410 thread) " 2oz bottle. (20/410).Tip Internal Dimension: 14 gauge (0.0781? or 1.98mm).Metal tip length is approx. 1?Tip has a hermetic seal screw-on plug cap with stainless steel pilot insert.