Features 1、Multiple Sizes: This glass drill bit has four cutter diameters of 3mm, 4mm, 5mm, 6mm, which can meet your different drilling needs. 2、Multifunctional: This glass drill is suitable for drilling holes in glass, ceramics, tiles, mirrors, flower pots, wood, porcelain , brick walls, marble, thin iron plates and so on. 3、Excellent Alloy Steel Material: This glass drill bit is made of excellent alloy steel material, which is sturdy and durable and saves time and labor. 4、Easy to Use: The drill bits have a 1/4 inch shank diameter, making them compatible with most drills. You can simply attach them to your drill and start drilling with ease. 5、Accurate Drilling: With their incisive and accurate cutting edges, these drill bits allow for clean and accurate drilling, reducing the risk of cracking or chipping the material. Specification Item Type: Glass Drill Bit Set Material: Alloy Steel Drill Bit Diameter: Approx. 3mm/0.12in, 4mm/0.16in, 5mm/0.2in, 6mm/0.24in Shank Diameter: 1/4 Inch Package List 4 x Glass Drill Bits