Cobalt Left Hand Drill Bit Set (1/16"-1/4") 13PCS | M35 High Speed Steel Jobber Length Drill Bit Kit for Removing Broken Stubs, Bolts and Screws, Reverse Twist Drill Bits

Suitable for drilling stainless steel, hard metal, aluminum, copper, plastic and hardwood. The 3-step design enables accurate centering, suitable for woodworking operations requiring precision drilling. In addition, the cobalt design allows it to perform better in hardwood boreholes. Control the bit speed from 200 to 1000 RPM, making it easier to drill in stainless steel. High RPM does not improve drilling efficiency, but rather increases the heat between the bit and the workpiece, which may cause the bit to soften and the workpiece to harden. Drill bit diameter ≤5mm, speed (1000~700)5-10mm, speed (700~350)10-15mm, speed (350~202) use cutting fluid to make the drill bit more durable. Stainless steel tapping oil or engine oil is added to prevent the stainless steel from overheating and forming a very hard oxide layer.

• Premium Quality: Made from M35 cobalt steel for exceptional durability and an extended lifespan.
• Innovative Design: Compact stubby drill bits, provide easy access to tight and hard-to-reach spaces. Features a 135° split-point tip with multi-blades for precise self-centering and efficient drilling.
• Versatile Application: Ideal for drilling stainless steel and tough metals like cast iron, titanium, bronze, and aluminum. Perfect for removing damaged studs, bolts, screws, or creating pilot holes.
• Commonly Used Sizes: Includes imperial sizes: 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 11/64, 3/16, 13/64, 7/32, 15/64 and 1/4 inch.
• Convenient Packaging: Comes in a sturdy plastic storage box with clearly marked sizes for effortless identification and organization.