Drip Line Hole Punch, The Pro Punch easily creates holes in 1/2" and 3/4" poly tube to insert the barbed ends of drippers, micro-sprinkler feedlines or fittings. Use punch with the blue insert when punching 1/2" tubing and remove the blue insert for 3/4" tubing. We recommend this punch to anyone that may be suffering from loss of hand strength due to arthritis or aging. Also, these punches are popular with contractors, landscapers, and commercial growers. The Pro Punch has a replaceable 3 mm tip. A Pro Punch makes punching holes easy!