Cobalt Drill Bit Set, 29PCS M35 High Speed Steel Jobber Drill Bits for Metal, Stainless Steel, Cast Iron and Wooden Plastics, with Metal Index Storage Box, 1/16"-1/2"

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• M35 Cobalt HSS Built: Made of industrial-grade M35 high-speed steel blended with 5% cobalt, our cobalt drill bits feature outstanding high-temperature resistance and hardness. They effectively dissipate drilling friction heat, avoid tip annealing during continuous heavy drilling, far outperform ordinary HSS drill bits, ideal for tough hard metal drilling tasks
• Various Sizes: This drill kit includes total 29 fractional inch 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", 1/4", 17/64", 9/32", 19/64", 5/16", 21/64", 11/32", 23/64“, 3/8", 25/64", 13/32", 27/64", 7/16, 29/64, 15/32", 31/64", 1/2". Rich size selection satisfies household DIY, auto repair, machinery fabrication and maintenance diverse hole-drilling demands
• Versatile Usage: Optimized jobber twist flute design delivers stable chip removal and smooth cutting performance. Perfectly drill stainless steel, cast iron, alloy steel, regular sheet metal, hardwood, softwood and all kinds of engineering plastics, one set fits multiple workshop & home drilling scenarios
• Sturdy Metal Index Storage Box: Comes with solid metal index storage case with clear engraved size marking on each slot. Every drill bit has fixed corresponding position, preventing bits loss, rust or messy scattering. Easy to pick required size rapidly and convenient for portable carry to job site
• For DIY & Professional Users: Precision ground sharp cutting tips ensure straight, clean holes without crack or burr. Suitable for professional mechanics, metalworkers, carpenters as well as home DIY enthusiasts for renovation, craft making, equipment repair and daily household projects