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Features: 1. A Must-have Hole Saw Kit for Glass Processing, Interior Decoration, or DIY Projects. 2. This 12 pieces drill bit set bores circles in ceramic, glass, granite, tile, slate and more in seconds. 3. With sizes ranging from 4mm-50mm in diameter, you'll have a bit for all of your needs. 4. Ingenious Design Makes Drilling a Breeze. Each drill bit comes with a shank that holds the bit in place without slipping. 5. Two side holes on bit allow for easy slug removal to increase drilling accuracy and efficiency. Obnoxious debris will be removed automatically so that bit last as long as possible. 6. Unbeatable Durability. The premium steel is double-tempered for increased hardness. They can cut through a wide variety of materials with little to no resistance. Specification: Material: Steel+ Diamond Dust Specification: 4mm*1, 5mm*1, 6mm*1, 8mm*1, 10mm*1, 14mm*1, 16mm*1, 18mm*1, 22mm*1,35mm*1, 40mm*1, 50mm*1 Notes: 1. These bit are not suitable for drilling concrete or materials that are thicker than 0.5 inch. 2. To prolong the life of bits, lower drilling speed and wet the surface with water for added lubrication. 3. If you smell burning, back off! Either your speed is too high or the pressure you're applying is too much.