12 Piece Black And Gold Coated Cobalt Drill Bits Set Five Sixteenth Inch Twist Bits In M2 High Speed Steel Built For Metalworking Pros With A Tough Black Gold Finish HRC 62 63 High Hardness Durability

12-Piece Cobalt Drill Bit Set in M2 HSS with Black Gold Finish
✔️ 5/16 in dia, 4-1/2 in total length, 135° point, 3-flat shank

Designed for metalworking pros and DIYers, this cobalt drill bit set is built from M2 high speed steel with a durable black-gold coating. It delivers fast, clean holes in metal, wood, and plastics, making it a handy addition to any workshop or service vehicle.

✅ Material: M2 High Speed Steel with cobalt coating; hardness 62-63 HRC
✅ Finish: Black and Gold coating for heat resistance and durability
✅ Size: 5/16 in diameter; total length 4-1/2 in; working length 3-3/16 in
✅ Point/Shank: 135-degree point; 3-flat shank for secure grip
✅ Pack: 12 pieces in a plastic bag
✅ Applications: metal, wood, plastics; not for concrete/masonry

💡 What is a cobalt drill bit set used for in metalworking and how does the coating help? This handy info explains the core benefits and best-use scenarios.
- increases heat resistance and edge life on stainless steel and alloys - maintains sharpness longer under heavy drilling without quick dulling - ideal for automotive, fabrication, and metalworking projects