Fineline Applicators-20 Gauge Dispensing Tip: 18/410 Cap. Fineline Needle Applicators are stainless steel applicators that use the FL air-tight non-clogging cap wire closure system to insure that the applicator and your preferred media are always ready for immediate use. The Fineline Needle Applicator is available in two sizes of dispensing needles: 18 guage (.8mm) and 20 gauge (.5mm). This package contains three 20 gauge 1/2 inch dispensing tips with a 18/410 cap. Made in USA.