4Pcs M35 High Speed Steel Cobalt Twist Drill Bit 5.5Mm Dia 1/4" Hex Shank

1. The hex drill bit is made of M35 cobalt high speed steel with sharp edge. High-temperature heat treatment makes the metal drill bit has higher hardness, better wear resistance and corrosion resistance, and longer service life than ordinary drills.2. 1/4 " hex shank, which can quickly replace the drill bit, eliminates the frustration of the handle rotation on the chuck, and makes it easier to quickly lock to the chuck. It is suitable for most electric hand drills and drilling machines.3. The fully ground spiral groove design can quickly remove debris, reduce friction and heat, and drill faster. The 135 ° straight shank split point reduces walking on the working face, making drilling accurate and easy.4. Hex twist drill bits are used for applications such as DIY projects, and home maintenance. Suitable for steel, copper, aluminum, zinc alloy, cast iron, wood and plastic.5. Please keep cool and gentle using, the working life of the twist drill bits can be largely prolonged by proper usage.