This nozzle can help to glue in narrow spaces, 3 different nozzle diameters meet different job requirements. ● Come with small wrench, fit the nozzle size, easy for the replacement job. ● Whole body Made by copper material, Excellence thermal conductivity make glue flow more smoothly and er. ● If you want to change the glue nozzles. you must wait for 30 minutes to wait the glue gun cool down comletely. Never touch the glue nozzles body when you use the glue gun.