GREENER Cobalt Twist Drill Bit Hex Shank Stainless Steel Special High Hardness Iron Drilling Set for Electric Drill

High-quality 21-piece set including 13 twist drill bits, 7 screwdriver bits, and 1 extension rod

Drill bits made of cobalt nitride (COBALT) with 65HRC hardness for enhanced durability, high temperature resistance, and extended lifespan (up to 3 times longer)

Suitable for continuous drilling without blade rolling or burning

Stainless steel drill bits with high hardness and wear resistance, capable of easily drilling stainless steel plates

Standard 135° full grinding angle with double rear blade angle for efficient and precise drilling

Enlarged U-shaped flute design for fast chip removal, preventing blade burning and improving work efficiency

Strong and long-lasting magnetic force in screwdriver bits for secure screw holding and easy operation

Extended magnetic extension rod for reaching narrow and confined spaces

Secure bit holder design to prevent loosening or dropping during use, resistant to impact and collisions

Stainless steel, mold steel, galvanized pipes, aluminum alloy, copper, iron, wood, PVC