TTP HARDDrills 5/64 Drill bit - Cobalt Hardened bits for Drilling Hard Steel & Stainless, Heavy Duty Universal Drills for Cutting Tough Metal, Professional jobber Industrial Drill bits

Doing a lot of auto resto, the broken stud has always been a headache. Used at the right speed with the right pressure and cutting oil,, these bits are the best i have found yet. I have drilled grade 8 bolts easily. Can you break them? Sure, their hardness is a plus for cutting and durability,,, but watch your chips as you can break them. I give these as gifts to my resto friends,,, they all love them.

These bits are great!! I broke two other bits trying to bore a hole length-wise through a hardened steel bolt. These bits not only finished the hole, it pushed the broken bits out.

Arrived on time, worked well on my test pieces so far. Only one bit for over 20 holes in 3/16 Stainless steel, and still works well.

I have been using TTP bits and Cut-It paste for a few years. A really good product.

Good product and arrived on time

After watching the impressive demonstration of this product on YouTube I was persuaded of its effectiveness; No even close.I used two different drill bit sizes for over one solid hour. The results are somehow embarrassing. In no way, this product cuts through hard metal as they claim. My right hand is sore for the extensive pressure exerted during drilling.Although the literature sounds good, in this practical application the results are diametrically opposed to what they advertised.I used a high-quality drill during this task.NO further comments.

Did not work on broken screw-not any better than normal drill bit.

These have lasted better than most drills Industrial use