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Cobalt Drill Bit Set for Hardened Metal and Stainless Steel, 99Pcs M35 High Speed Steel Twist Jobber Metal Drill Bits 1/16″-3/8″, with Plastic Index Storage Case 1/16-3/8 in (99pcs)
If you drill stainless steel or other tougher metals often, a cobalt set can be a practical upgrade over typical HSS bits. The Sinyeenglon 99-piece set uses M35 cobalt steel and a hardened full-grinding process aimed at improved wear resistance and longer service life, especially when you keep speeds low and use cutting fluid.
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This set covers common fractional sizes from 1/16" to 3/8" with multiple duplicates of small, frequently used bits. It also includes a hard, thick plastic index case with compartmentalized storage and size markings printed on the inside of the lid, making it easy to grab the right bit quickly and keep your set organized.
M35 cobalt steel construction for drilling hardened metal and stainless steel
99-piece jobber-length twist bit assortment from 1/16" to 3/8" (includes duplicates of popular small sizes)
135° split point with spiral flutes and 2-flute design for metal drilling tasks
Gold oxide finish and hardened full-grinding process for wear resistance and durability
Plastic index storage case with labeled size layout for convenient access and organization
Use notes: For best results on metal, keep the bit vertical to the workpiece, use a lower RPM range (the brand suggests 200–1000 RPM), and apply cutting fluid to reduce heat and extend bit life.
