Are these bits tough? Well, there made by Glacier so yes, yes they are. In fact, there the toughest on the market. Here's why:
 
	
ALL 3/8" DOUBLE SPIRAL STEEL
	
4' LENGTH
	
FORGED HIGH STRENGTH STANDARD TEETH (CARBIDE TEETH AVAILABLE)
	
2 YEAR WARRANTY
	
POWDER COATED FOR LASTING FINISH