Material: Made of high quality plastic and metal, durable, stable and will not rust. Besides, the hole punch is polished and can be used for a long time. Tight Fit: Punch 4mm holes for a perfect fit to avoid waste loss and maintain proper pressure in your system. Easy to Use: You can use a hairdryer to slightly soften the part of the pipe where you want to drill. Hold the handle of the drip irrigation hose and squeeze the hose. Gently press until the hose is pierced.