The Steinel 4007841070311 shrink nozzle is a window-style nozzle with an inner diameter of 34mm and a width of 50mm. It is designed to be easily attached to a heating element, such as a heat gun, and is used to quickly and efficiently shrink heat-shrink tubing, films, and other shrinkable materials. This nozzle has been designed and manufactured by Steinel, a leading manufacturer of power tools and accessories.