1、FAST CHIP REMOVAL: The countersink drill bit can quickly discharge debris from the hole, effectively prevent the accumulation and improve drilling efficiency. 2、ADJUSTABLE LIMIT: This countersink drill bit comes with adjustable limit, will not puncture, can be used with confidence. 3、ALLOY STEEL MATERIAL: The drill bit is made from premium alloy steel material, with strong bending resistance, wear resistance, ensuring service life. 4、STANDARD SIZE: The drill bit is precisely machined with standard size, and can be perfectly compatible with manual or electric tools. 5、WIDE USAGE: This drill bit can be used for countersinking and tapping wood, plastic, soft metal, fiberboard, aluminum alloy screws, etc.