Afunta 16 Pcs Diamond Drill Bit Set Diamond Hole Saw Remover Tools for Glass Porcelain Ceramic Granite Stone Machining Tools 6-50mm

Used 16mm drill bit to make drain hole in Nescafe bottle, Did for 20Still working ... But little rough cut now but still it makes hole.While cutting Just follow direction for angel and keep water flowing.

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I lost my temper glass after few seconds. ):

Vienen todas en una bolsa, se hace el agujero perfecto eso si... echando agua para que no se caliente

Done the job .. highly recommend

for the price this package is great, however the grit on the drill bits is extremly rough, which means if you are using a hand tool, and do not have the item you are drilling throughly clamped you are likely to break the drill bits or the item you are drilling into. i attempted to use the bits by hand, but the drill would not remain steady upon contact and jumped around. i am using these for cutting glasss, and luckily i used a scrap piece to test because it broke. luckily i also have acess to a drill press, otherwise these would have been impossible to use, and i am not shocked that they have broken on people. that being said they got the job done, and for the low price and quick delivery it was worth purchasing.

The first hole I drilled in my ceramic tile I should have worked the bit around at an angle because after I had finished I had real difficulty removing the hole plug as it was firmly jammed. I fact I nearly wrecked the bit getting the plug out as the steels used seem to be pretty soft so the barrel ended up distorted and bent, it won't ever be the same. Having said that the price was right so I guess I shouldn't complain. There seems to be a reasonable amount diamond grit applied. I used plenty of water but after four holes (1" dia bit) with the same bit I found the diamond grit was virtually gone.

Good enough for a single use and then unusable