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See more product details Drill Hulk cobalt drill bits are made from high-speed steel and 5% cobalt. The addition of cobalt improves strong durable performance in harder materials especially stainless steel. Made in China You Will Get: 12 pieces of 7/32-inch. x 3-3/4-inch. cobalt drill bits with case Notice: For high-speed drilling through metal, lubricate the bit with lightweight oil. Warning: Drill bits can shatter during use. Always wear safety goggles and safety items when drilling.