Professional-grade cobalt drill bit set engineered for demanding applications. This 15-piece set delivers precision drilling in hard materials including stainless steel, cast iron, and aluminum. Bits range from 1/16 in. to 1/2 in. in 1/32 in. increments, providing complete coverage for most job-site needs. Cobalt construction resists heat and wear, extending tool life on high-speed drilling tasks. Durable plastic case keeps bits organized and protected on the job. Ideal for contractors and serious DIYers who demand reliability and accuracy.