State of the Art Design: These diamond drill bits are the perfect addition to your took kit! circular design removes clean circles, and the side holes discharge slugs automatically for maximum efficiency. Better yet, the prevents slipping and holds the bit securely in place!12-in-1 Powerful Diamond Dust : Take your drilling to level. Thanks to the luxurious diamond dust, these high-quality bits take will an drilling performance for years on end.Extremely Versatile Set: If you can dream it, you can do it. Diamond Drill Bits will remove a from glass, tile, , granite, ceramic, and more.The Perfect Size for Project: Each kit includes 12 different sizes ranging from 4mm- 50mm in diameter. Drill small holes, holes, or something in between. You'll have perfect size for each and circle. Friendly: These bits are great for amateurs and alike! Drill diagonally to score your hole, and then hold the drill at a angle to bore through the material. You'll be done in no time flat.A Must-have Kit for Glass Processing, Interior Decoration, or DIY Projects Alike! Design Makes Drilling a BreezeEach drill bit comes with a that holds the bit in place without slipping. You'll be to drill clean holes effortlessly! Two side holes on the bits allow for easy removal to increase drilling accuracy and efficiency. Obnoxious debris will be removed automatically so that the bits last as long as possible.Notes:1.These bits are not suitable for drilling concrete or materials that are thicker than 0.5 inch.2.To prolong the life of the bits, lower drilling speed and wet the surface with water for added lubrication.Material: steelColor: Silver Feature: Always use water for lubricationPackage Contents:12x Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.