Bosch® cobalt M42 metal drill bits are engineered with upgraded M42 alloy, containing 8 percent cobalt. These hard-core cobalt bits deliver ten times the life versus standard bits, are jobber length, and withstand high-heat applications. The thick web-helix design delivers fast material removal and increased stability. Bits that are 1/8″ and larger feature a split point; bits 3/16″ and larger feature a three-flat shank, for better bit grip. These cobalt drill bits provide superior performance in stainless steel and can be used to drill cast iron, titanium, and other hard or abrasive metals. Upgraded M42 cobalt jobber-length designed for durability, high-heat resistance, and hardened surface for stainless steel, cast iron, titanium, light-gauge metal, and aluminum. Enhanced M42 alloy material contains 8% cobalt alloy that delivers 10x life vs. High-heat resistant bits withstand high-temperature applications for extended periods of time. Thick web-helix design provides additional stability in tough applications. Surface-hardened tip penetrates tough abrasive materials. Split points on bits 1/8 and larger allow for easy starts with no skating, eliminating need for a center punch. 3-flat shank on bits 3/16 and larger deliver better bit grip. Bit sizes included: (2) 1/16″, (2) 5/64″, (1) 3/32″, (1) 7/64″, (2) 1/8″, (1) 9/64″, (1) 5/32″, (1) 11/64″, (2) 3/16″, (1) 13/64″, (1) 7/32″, (1) 15/64″, (2) 1/4″, (1) 5/16″, (1) 3/8″, (1) 1/2″. Our other warehouses is in HongKong, shanghai china. A: MY store accepts major credit carts. Q: How do I return an item? Please contact our customer service before you return an item. We will work hard to make sure EVERY CUSTOMER 100% SATISFIED and resolve any problem for you and always leave a feedback to all our customers. If you are satisfied with the product you received, wish you can leave us a feedback.