10PCS Masonry Drill Bits with 60mm Extension Multi-material masonry drill bit set for drilling in tile, glass, concrete, brick, wood, and plastic. The extension drill bit can quick change and release system allows you to quickly install, lock and unlock ceramic tile drill bits easily Extension bits fits for power driver, drill and handheld screwdriver which is 1/4" hex shank (6.35mm) Concrete drill bit set can be installed on various ordinary drills such as electric drill, hand drill and bench drill The hex shank glass drill bits is designed for anti rust,wear-resistant and corrosion resistance to last long life. The twist ceramic tile drill bit comes with case to easy to storage and portable for our work and project Do not use impact mode of drills or hammers when use the drill bit sets. Drilling speed of the drill bit should be slow, especially in the beginning of drilling. Please try to keep the drill vertical and use WATER or COOLANT for lubrication when drilling. 10PCS Size 1x2.36" extension bit 2PCS 3/16" diameter Length 3.7" 4PCS 1/4" diameter Length 3.94" 2PCS 5/16"diameter Length 4.17" 1PC 3/8"diameter Length 4.57" 1PC 1/2"diameter Length 5.04" 1* Plastic Storage Case Cross Edge and Raw Cutter Head Carbide cross-heads which has higher hardness and smoother drilling.And cross edge feature drilling stably, fast speed and breaking the border High-quality materials and New Design The hex brick drill bits designed anti-slip hexagon which ensures a tight fit and is suitable for electric drill, hand drill and bench drill. The drill bit is made of high quality that it is more wear-resistant,more durable and use long time Read more Diamond Drill Bits for Glass Metal Drill Bits Magnetic Impact Driver Bit Set Masonry Drill Bit Sets Compatible Material Porcelain, Glass, Ceramic, Marble, Stone,Wood Metal,Hardened Steel Screws Glass,Tile,Stone,Marbel,Granite Material Diamond+Steel Cobalt Steel Magnetic+S2 Steel Carbide+ High Speed Steel Shank Type Round Shank Round Shank Hex Shank Hex Shank Package 11 PCS 15PCS 10PCS 11 PCS