Comes with 2-3/8" diameter (approx. 60mm) Glass Hole Cutter for our 1-1/2" bulkheads used with our H2Overflow® and a H2Overflow®/Siphon Stopper® drill template.
Glass Hole Cutter is intended for low volume drilling of approximately 5-10 holes. Could be more or less depending on glass thickness and other factors.
Please read our hole drilling instructions for more details. All holes drilled at your own risk - please read our hole drilling disclaimer.