EASY GRIP: Handle constructed of durable plastic and non-corrosive materials TIGHT FIT: Punches Holes measuring 3 mm (0.118 Inches) for a snug fit to eliminate waste loss and maintain appropriate pressure in your drip system USE: Used to puncture holes when installing drippers and micro sprinklers in polyethylene tubing Punches the perfect size hole to attach fittings and couplers Easy to use. Just insert tubing and gently squeeze the punch until it is punctured. One Stop Outdoor Universal Drip Irrigation Tubing Hole Punch Tool - for Easier 1/4" Inch Fitting & Emitter Insertion