Feature 1LIMIT ADJUSTABLE: The drill bit's premium punching efficiency and ability not to pierce wall are both attributes of its adjustable limit. Use as needed. 2STEEL ALLOY MATERIAL: This drill bit is made of premium alloy steel, wear and impact resistant, and has a long lifespan. 3FAST CHIP REMOVAL: A spiral groove with a central drill bit will efficiently prevent the accumulation of retained rock cuttings, quickly discharge debris from the hole, and increase drilling efficiency. 4WIDE APPLICATION: This drill bit can be used for countersinking and drilling soft metal, fiberboard, wood, plastic, and screws made of aluminum alloy, among other materials. 5EASY CARRYING: The drill bit set is lightweight and portable for easy use, do not take up much space, use at will!SpecificationItem Type: Counterbore Drill Bit Material: Alloy SteelColor: SilverSpecification: Approx. 3.5 x 10mm / 0.14 x 0.39in Application: Used for countersinking and tapping wood, plastic, soft metal, fiberboard, aluminum alloy screws, etc. .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Counterbore Drill Bit1 x Wrench1 x Hex Wrench1 x Set Screw1 x Storage Box