Tian 6pcs High Hardness Titanium-coated Carbide Alloy Glass Drill Bits 4mm/5mm/6mm/8mm/10mm/12mm - Quick Drilling Porcelain Tile Drill Bit Spear with 1/4" Hex Shank for Ceramic Mirror Marble

These worked perfectly for me, and was great for my needs of making a small hidden hole in glass. But if you wanted a higher level of accuracy you may need to look elsewhere. The head on the drill bit is slightly curved so you wouldn't be able to pin point the exact spot of drilling, but like i said perfect for my needs and very cheap too. My main issue though was that they came to me covered in machining oil so i did have to clean them thoroughly first.

Does exactly what it says on the tin. I needed to add a splash guard in my bathroom as a member of my family is quite liberal with the amount of water is splashed whenever she uses the shower, resulting in water stains on my kitchen ceiling, below the bathroom. I needed to drill through wall tiles and theses drill bits when through the tiles in seconds without chipping them. Perfect.

Packaging was unexciting but does the job

Excellent. For the money I paid for these they are great. Easily drilled a hole in a heavy old ceramic pot I wanted to use for a plant. I wouldn't hesitate to recommend them. No sign of wear yet either. I thought these might last for the one job, but I think they will last a lot longer. Well made too.

Worked well drilling nice clean holes through my tiles just where I planned. I recommend practicing on a spare tile first

Cut through very fragile and thin glass bottles with ease. Manufactured well so that on rotation there is minimal shaking or movement away from centre

Does the job - just keep the tip cool to prevent the tiles breaking.

cheap to by very good product drills holes in bottles ect no problem