Orbit Drip Irrigation Punch Tool. Made of plastic and has a black color. The product dimensions are 5.25" in height, 1" in depth, and 3" in width. It has an inner diameter of 0.25" and an outer diameter of 0.25". The punch tool is used to create a perfectly sized hole in 1/2 inch drip tubing, allowing for the insertion of 1/4 inch barbed drippers or fittings. By applying a small amount of pressure, a perfectly sized hole is created in 1/2 inch drip tubing. The 1/4 inch barbed drippers or fittings can then be inserted into the 1/2 inch tubing.