Package Contents: This step drill includes a 5-step drill and 1 automatic center punch. You can process 50 different kinds of diameter holes with this 5-piece drill bit. Titanium Coated: These step drill bits are made of high-speed steel with titanium coating, ensures durability and sharpness in standby, can reduce friction, runs cooler. Automatic Center Stamp: The center punch can help you mark the center point of the hole you want to drill and make your process easier. Additional Use: Our step drill bits are designed to easily cut/drill through steel sheets, aluminum sheets, wooden boards, plastic boards, etc. (not including steel or any other harder metals). Suitable for home DIY and general construction and engineering. Aluminum Storage Case: Our all drills are all in an aluminum box for your convenience and storage. And the aluminum shell protects the drill bit from being easily dulled and extends the life of the drill. Automatic Center Punch The center punch can help you mark the center point of the hole you want to drill, making your operation easier. Titanium Coating Titanium coating ensures exceptional durability and sharpness which can reduce friction and run cooler. The hex shank fits into all power tools more easily and securely. Widely Application These step drill bits are designed to easily cut/drill through steel sheets, aluminum sheets, wooden board, plastic board, etc. (excluding steel or any other harder metal.) Package Includes This kit includes 5 pieces of bits and 1 piece of automatic center punch. And all of them come in an aluminum box for your convenience and storage. Welcometomeet