AcogedorAcogedor 10Pcs Diamond Tipped Drill Bit Set Twist Drill Bits for Glass Tile Stone, 0.8mm / 1.0mm / 1.2mm / 1.5mm / 1.8mm / 2.0mm / 2.5mm / 3.0mm / 3.5mm / 4.0mm

Came quickly and worked great on drilling through tile. Did not crack. Recommend.

Well, to start, these must be used on a submerged workpiece or else the diamond will heat up too much and evaporate. I've had good experiences with these bits and bad ones, and generally the bigger the bit is, the better it works. The smaller ones however, are prone to breaking so when using a drill press (which these should never be used with a hand drill) use minimal pressure. I also had one package arrive with two of the smallest bits missing from the package and were nowhere to be found. But atleast I had another set, the reason I bought two was because I broke two of the medium sized bits drilling into a slab of agate. I needed those bits as they are just the right size for the jewelry I make. So I ordered another set. Just be careful with these bits, they are a little tempermental and aren't as sturdy as most drill bits are. You can't apply as much pressure to them as you could with a tungsten-carbide drill bit of the same size.

Perforó un vidrio de 15m"m de espesor ,lo cual desgasto un poco la broca.

First time out of the box and attempting to cut some simple sea glass and two of the bits I’ve broken. It cannot withstand even gentle pressure and snapped in two.Will need to find a different brand/vendor that has better quality.

Useless product, could barely drill a hole in wood much less in a shell or even glass. Tried to use a smaller bit and it immediately broke in half against a thin piece of sea glass that it barely even scratched. Don’t waste the money you work hard for on this crappy scrap metal.

The media could not be loaded.  He podido perforar totems de piedra que había tallado!!

had to drill slowly and over the course of a couple of days.

Works well.

Ordered for drilling sea glass they work great

Las brocas más delgadas se acabaron completamente, las usé para perforar unos pedazos muy pequeños de cerámica. Unas se rompieron; otras perdieron totalmente la punta y en algunos casos, la hélice. Las usé debajo del agua y aún así, justo donde tenían que abrir, se ponía de color rojo por la fricción. Sin embargo, la relación precio calidad me parece buena ya que pude terminar lo que tenía que hacer.

They drilled through acrylic and glass for me when I needed it and did a perfect job. The only problem was that it would slip in my drill and not spin sometimes.

Personal hand made art craft.

They are listed for drilling stone. This is one of the bits after drilling 1 stone.This bit has been placed on a popsicle stick for size refference. I would not recomend for drilling stone. It may work for other materials but definitely not stone!