I can drill up to 1/2" glass with my dremel and I did a whole for a 1 1/2" bulk head in about 20 min....you can push those dremels pretty hard when drilling glass!!! 
		
	
		
		
		
		
			
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				500G Mixed Reef
   
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Electrician, Electronics Technician, I can help with any electrical questions you might have!! 
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Kevin
			  
		
		
		
		
	
		
		
	
	
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