Wensilon Concrete Drill Bit 5pcs 3/8" X 6"-4" Cross-Type Double Thread Carbide Material Suitable for Concrete, Brick, Cement Walls, Stone, Hammer Drill Bits for Concrete

Worked well, durable, only used one to drill 12 holes in concrete block and it is still OK

10 times better than the Tapcon bit that came with the Tapcon concrete screws. That bit lasted about 4 holes before it was too dull to use (was using in hammer mode with regular drill). With these bits (which require a genuine rotohammer) I got a little over 40 holes in concrete before the bit broke. The second bit finished the job (about 60 holes total). Go slow and dip in water and they will do the job. I double ordered and ended up returning the second set because I didn't need them.

I had an existing hole in my outside stone wall that was drilled exactly to size for the copper water line to an old spigot. The new spigot has a larger body, so I needed to widen the hole. AI told me to get the 1-1/4" bit, but the 1" probably would have worked just fine. I don't have a hammer drill and used my trusty standard Bosch. With cavitation, the resulting hole came out to about 1-3/4". I wasn't sure how deep the stone was, the wide body on the new spigot is somewhere between 12 and 13 inches, I didn't want to take any chances on one that was 12 inch, so I opted for this 18"-16". I'm very happy with the way it all turned out. The bit worked well, and the hole is very good. Take note - this is a big/heavy bit. It does also come with a nice plastic storage tube.

A bargain at twice the price!

These are great for the price. I used these to bolt a storm shelter directly into the concrete slab and had no problems at all with these bits. Although did end up using all of them, didn’t last super long but we did about 15 holes. Would use these again if I had to drill into concrete again

Very good price for 5 very good bits

Save the money and buy a known brand. I use hammer drills daily and I bought these in a pinch for a home project. One hole and the bit was bent. Ended up breaking all of them drilling 20 holes. Buyer beware. You get what you pay for.

All Excellent, delivery and quality...

Awesome, drill into reinforced concrete like butter. Compare to Makita 4mm drill bit at 50mm(110mm total) in length, these 4"/100mm(150mm/6" total) drill faster with less resistance. Also, the CONFAST 3/16" concrete screw broke when screwing into the hole drilled by the Makita 4mm drill bit. Might be the Confast screw is lousy or the 4mm hole is too big? But 5/32" IS ‭3.96875‬, ‭ ‭0.03125‬mm smaller than 4mm, I don't think that would made any difference. I would say these drill bit created cleaner hole for the 3/16" screw to bite on. I was kind of disappointed with the first concrete screw I ever tried as it broke but these work wonderfully, Highly recommended!