https://www.irrigationdirect.ca/DD-HP250-DG-Deluxe-Hole-Punch-for-1-4-Barbed-Fittings-and-Drippers..htmlFor watering row crops & vegetable gardens. Connects 5/8" drip tape (16 mm) to 1/2" or 3/4" solid drip poly tubing. 1/4" barb is inserted into poly tubing. Perfect for setting up small to medium sized vegetable garden watering systems.