150mm Length: When you meet obstructions or when deep holes are required, the 150mm length drill bits are very useful.

Four Sizes: Drill bits with diameters 3mm, 4mm, 5mm, 6mm are the most prevalently used sizes. We are confident that this set can fulfill the vast majority of your drilling needs. There is always one correct size right for you this time or next time.

Cobalt material: These drill bits are made of high-speed steel cobalt, which has excellent hardness and wear resistance, making them an ideal choice for drilling various metals.

Faster Drilling: The 135-degree point tip enables rapid penetration with less pressure, and the twist design efficiently removes metal shavings.

Versatile Use: Great for drilling hard metal, stainless steel, cast iron, copper, aluminum alloy, PVC, plastic, wood. Please pay attention to the control of speed, pressure, and heat while drilling.