uxcell 10Pcs 6mm Diamond Coated Hole Saw Drill Bits for Glass Ceramic Tile Marble Rock Porcelain

One of the screws holding the front gate striker plate had sheared off. The remaining part of the screw was about 5mm below the level of the rawplug. Brought sizes 6mm/7mm, drilled top part of rawplug, away, using a normal drill bit. Used the 7mm. Initially had the drill in clockwise mode, changed to anti clockwise mode. It took a few minutes, with pressure, drill went fully in. (Using water frequently to keep hole drill bit cool) When withdrawing the drill you could see the screw in the shaft of the drill bit through the open aperture on the side of the drill bit. Well worth the money. I would highly recommend the product and seller.

I didn't buy these to make holes in masonry or anything like that. I used these to drill out a snapped screw tapping bit in my manifold on my car. Took a long while since I was drilling on my back and went through 3 of them but it worked when nothing else would. These things saved my car and a lot of money. They are the real deal.

So I was trying to remove a snapped off M6x12mm bolt on an older motorcycle crank case, and stupidly I initially decided to use a spiral extractor bit to try to twist it off, but of course SNAP, and the hardend steel broke off inside. Bought these in an attempt to remove it so I can drill again and re-tap, and I'm pleasantly surprised it's actually working, slowly but surely. As seen in the picture attached, at this point I've dulled one bit and have moved onto a second. The 10 piece set should be more than enough to get clear all the way through. Expect to use a few for this type of application. Oh and make sure you have something on hand to squirt water on the bit for cooling. I use distilled to lower chances of corrosion.

This works great for drilling through rock, as we make rock necklaces

Good bits but use water to cool them down. Water drilling otherwise good luck