Premium Quality: Made from tungsten steel and heat treated. Ensuring its high hardness, sharp edge, high precision, smooth cutting, impact resistance, high toughness 5PCS: include 40 or 45 or 50 or 60 or 70mm, can be used for punching wooden products, mounted spherical door push tip, drawer, plastic products, wood, plywood, etc. Warm Tips: We are all over 40mm large size drills , it is better to use machines with good fastening performance for drilling operations, such as drills, bench drills, vertical drills and stand motor drill. if you need to work with a hand-held electric drill, it is better to use it with a vise with good clamping effect. Easy to Store: each drill is packed separately in a plastic bag containing oil to prevent rust. And each drill has a plastic storage box to prevent the drill bits from getting dull. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.