General description Made of hard alloy, this glass drill bit set features excellent abrasion resistance and extreme hardness for a longer service life. The titanium-coated surface is anti-oxidation and does not fade. This set includes 6 different sizes: 3mm, 4mm, 5mm, 6mm, 8mm, and 10mm, all with a 1/4" hex bit that fits perfectly for various tasks. Technical specifications Material: Tungsten steel Coating: Titanium Sizes: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm Shank: 1/4" hex Usage Excellent for making clean and precise holes in glass and tiles. The fine edge ensures smooth and complete holes without burrs. Using water lubrication will greatly extend the life of the drill bits. Other information Ideal for DIY enthusiasts and home use for drilling ceramic mirrors, glass tiles, and other rigid and fragile surfaces.