This ladies are designed for glass and tiles even in small sizes and it is easy to attach to cooling systems.In order to change to a larger drill bit: loosen the 2 screws and turn the V-Notch piece to 180 ° and then tighten the screws for usage.
It can be expanded from 18mm-22mm and 18mm to 75mm for
Addax high quality, Not cheap quality item.
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1x Adjustable 4-83mm Glass openings Locator (not include the drill bits)