Comes with 1-1/8" diameter (approx. 28mm) Glass Hole Cutter for our 1/2" bulkheads used with our Siphon Stopper® return fitting 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.