6 Different Sizes: Used for drilling holes of about 22, 28, 35, 44, 68 and 73 mm (0.9, 1.1, 1.4, 1.7, 2.7, 2.9 inches) in diameter. Easy to Use: This is an upgrade design, simple bolt-style design, instead of the traditional assembly method. the old one. Efficient: The drill bits are made of high quality alloy, with coated metal particles, practical and easy. Application: Ideal for cutting holes, such as tile, ceramic, brick, gypsum board, concrete, etc. Suitable for hand drill, bench drill, vertical drill, etc. Suitable for: Air Drill Item Descriptions: Easy to use: This is an upgrade design, simple bolt-style design, instead of the traditional assembly method. old. Efficient: The drill bits are made of high quality alloy, with coated metal particles, practical and easy. Package: includes 6x different size hole saw drill bit 1x large chuck 1x small chuck 1x hex wrench 1x storage box 6 different sizes: Used for drilling holes of about 22, 28, 35, 44, 68 and 73 mm (0.9, 1.1, 1.4, 1.7,