🔨15 Different Sizes - Each glass drill bit set contains 15 sizes to meet your daily needs, including 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 30mm, 35mm, 40mm, 50mm, suitable for different needs 🔨High Hardness Material - This diamond drill bit is made of high quality steel . Diamond core bits have good wear resistance, extremely high hardness and long service life. Note: There may be partial rust inside, which will not affect the use 🔨Woodworking Assistant - Compatible with popular electric drills and bench drills . Essential DIY items, suitable for DIY, professionals, all hobby craftsmen, hobby workshops, family households, do-it-yourselfers, etc. 🔨Drilling Technique - Before drilling, place the diamond drill bit at a 45 degree angle to cut the arc, then insert the bit directly into the glass. This prevents the tool from moving during operation, allowing you to drill more precisely 🔨Multiple Uses - Easy installation and high drilling speed, very suitable for drilling precise and smooth holes in glass , ceramic, marble, ceramic tile, large glass, fiberglass tile, ceramic, slate marble, light granite, etc. Product Excellent for anyone who likes /DIY and neat work, it makes a clean and precise hole on glass and tiles. when using this type of bit, it should be kept moist, as heat will build up and harm not only the bit, but also what you are cutting. Usage: 1.Start your hole diagonally, make a round trace and keep the bit straight. 2.Always use lu/brification (water), otherwise the diamond core drill/ will burn. 3.Low drill pressure and increased use of water lubrication will greatly extend the life of the drill bit. 4.Do not use on concrete or for depths greater than approximately 1/2". Package Included: 1 x 6mm Glass Drill Bit 1 x 8mm tile drill 1 x 10mm diamond drill bit 1 12mm diamond hole saw. 1 14mm diamond drill bit. 1 12mm ceramic slicer 16 mm 18 mm diamond drill bit. 1 20 mm diamond drill bit. 1 hole saw 22 mm 1 ceramic drill bit 25 mm. 1 28mm ceramic drill bit 1 30mm hole saw. 1 35mm glass cutter 1 ceramic drill bit 40 mm 1 diamond drill bit for ceramic tiles 50 mm