Bihui Tools Diamond Countersink Bits

Diamond countersink bits are designed to enlarge, bevel and ease stress in rough drilled tile holes. 

• Reduces the risk of stress related cracking where large format tiles are subjected to tension.  
• Clean up finished edges of exposed tile around floor drains or other protrusions.   
• 5/8"-11 threaded arbor  
• Medium grit
• May be used wet or dry