Material: Made of high quality plastic and metal, durable, stable and rust-proof. In addition, the puncher is polished, can be used for a long time. Tight Fit: Punch 4mm holes for a snug fit to eliminate waste loss and maintain the proper pressure in your drip system. Size: Suitable for polyethylene pipes with a diameter of 16/20mm, 3mm perforations Easy to Use: You can use a hair dryer to slightly soften the position of the pipe where you want to pierce. Hold the handle of the drip irrigation tube and squeeze the tube, gently press it until the tube is pierced. What You Get: 1 x Exquisite Drip Irrigation Tubing Punch Tool for 6.35mm Irrigation Hose. Good tools for gardening and irrigation