1、Reliable Drilling: Having been through fine workmanship, the countersink drill bit is very sturdy under bending and high working speed. 2、Fast Chip Removal: The spiral flute can quickly remove the wood chip, thus preventing the residue accumulation and improving efficiency. 3、Adjustable Design: Equipped with drill stop, the counter sink drill bit enables easy adjustment on the drilling depth, meeting your needs. 4、Wider Application: Adopting premium alloy steel material, this drill bit is suitable for wood, plastic, soft metal, fiberboard and so on. 5、Simple to Install: Comes with a compact size and a light weight as well, the 4.0x8mm countersink drill bit is very convenient to install. Item Type: Countersink Drill Bit Material: Alloy Steel Color: Silver Specification: Approx. 4.0 x 8mm / 0.16 x 0.31in Use: Used for countersinking and tapping on wood, plastic, soft metal, fiberboard, aluminum alloy screws, etc. 1 x Countersink Drill Bit 1 x Wrench 1 x Hex Wrench 1 x Set Screw 1 x Storage Box