The Ss Brewtech Drill Bit Kit For Re-Circ Bulkhead includes the necessary drill bits required to retrofit your existing 10 gallon Infusion Mash Tun with a re-circulation bulkhead fitting. This drill bit set makes drilling the perfect sized hole easy, if you want to drill a 5mm, 22mm, or a 30mm hole this kit is perfect. Using this bit kit allows you to take advantage of the myriad of mash accessories such as vorlauf attachment, re-circ manifold, etc.Please Note: If you choose to drill a hole into your equipment it is your responsibility, OntarioBeerKegs will NOT replace or accept returns on kettles, brew buckets, or chronicals that you yourself have damaged.Includes: 22mm hole saw drill bit (Carbide) 30mm hole saw drill bit (Carbide) 5mm pilot drill bit Ideal for: Retro-fitting existing 10 gallon Infusion Mash Tun with a re-circulation bulkhead fitting Retro-fitting any existing kettle to take advantage of mash accessories such as vorlauf attachment, re-circ manifold, etc.