It cuts a V-notch in urethane tube nozzles. utting the proper V-notch on a urethane nozzle can be difficult and dangerous. The Equalizer Top Notch tool takes all the guess work, and danger, out of V-notching the nozzle. This high quality tool will last for years. It features a chrome metal body, tempered steel jaws, spring-loaded handle with non-slip plastic grips, and a thumb controlled jaw locking device. To use this tool, take a utility knife and cut the end of the nozzle tip to give yourself a 1/4" or larger bead. Next, insert the Top Notch tool inside the nozzle until it stops. Squeeze the handle and you have a perfect notch. Made in USA.