I know that these diamond coated drill bits won't last for ever. I have learned that your drill bit may drill as few as 18 holes to over a hundred. To extend the life of your drill bit you need to keep the tip of the bit wet with water and use an up and down drilling motion.
Yoy can order drill bits directly from me. I usually have available the following drill bit sizes.
Diamond coated 3/8 @ $6.00
Diamond coated 1/2 @ $9.00
Diamond coated 3/4 @ $10.00
You may order by email at starkey25@verison.net. Please add .50 per drill for first class postage. Have a great day
