DescriptionMade of metal material, durable and long time use. 10 different diameters, perfectly meet you need. Designed for DIY bead use, also it is suitable for use in drill hole on glass, marble, tile or granite. Opening neat, smooth, no broken edges, will not produce tremor. Fit with most kind electric drill perfectly, let you use it more easily.Features- Color: Silver - Material: Metal - Size: 3 x 3 x 5.2cm. - Made of metal material, very durable, long service life. - 10 different diameters, included 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 18mm, 32mm, 50mm, 10 different kind of size, meet you what you need perfectly. - Opening neat, smooth, no broken edges, will not produce tremor. - Professional designed for handycraft DIY use, also it can be used in on glass, marble, tile or granite material. - Fit with most kind of standard electric drill well. - Warm Tip: Dear buyer, Due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you!