This versatile set lets you adjust the shape and size of your hot glue bead upon application. Compatible with full size glue guns in the following glue gun lines: Ultra Series (DT-360, DT-3100), Essentials Series (L-270, H-270, DT-270), and Professional Series (PRO2-60, HE-750, DT-750, PRO2-100, PRO2-100L). Orifice sizes are .093 inch for the small round nozzle, .125 inch for the large round nozzle. The flat nozzle has an .145-inch orifice with a .17-inch width. Keep this handy nozzle set in your toolbox so you can easily adjust the size of your glue stream for greater precision in adhesion.