3/8 Inch x 12 Inch Cobalt Aircraft Extension Drill Bit Set (3PCS) M35 High Speed Steel Extra Long Drill Bits for Deep Hole Drilling for Stainless Steel, Hard Metal, Cast Iron, Wood & Plastic

3/8 Inch x 12 Inch Cobalt Aircraft Extension Drill Bit Set (3PCS) M35 High Speed Steel Extra Long Drill Bits for Deep Hole Drilling for Stainless Steel, Hard Metal, Cast Iron, Wood & Plastic

• 【Drill Bit Dimension】: 3/8"(Drilling Diameter) x8"(Flute Length)x12"(Overall Length) Metal Drill Bits to meet your precise requirements in different projects and machining needs.
• 【M35 Cobalt High Speed Steel】：Our drill bit made with M35 cobalt (5% cobalt) which provide excellent durability and superior resistance against abrasion and high heat and has a longer service life than ordinary HSS drill bits, making it suitable for high-intensity operations.
• 【135 degree Split Point】:These cobalt drill bits feature a 135 degree split point tip that automatic centering to prevent "slippage" or "offset", no need to pre-punch the center hole.
• 【Multiple Application】:Best used for drilling deep hole in metal hard metals, stainless steel, cast iron, steel, titanium alloy, hard plastics, wood and more, and a wide range of applications such as repair, construction, or woodworking.
• 【Surface Treatment】:The bright finished surface treatment strongthen the hardness of drill bit body to ensure the long drilling life and better drilling performance.