Carbon Steel Drill Bit 1/6″ To 1/2″ 29Pc

29PC CARBON STEEL DRILL BIT FRACTION SIZE: 1/16″ TO 1/2″ 
This kind of drill bit only for soft material drilling such as wood, plastic, paper etc. For what is carbon steel please read follow information:
Carbon Steels
Low and high carbon steels are both used for drill bits, but for different purposes. Soft low carbon steel cannot cut hard metals due to their poor tempers, but they can cut wood. They require sharpenings to extend their lifespan. The primary bonus of low carbon steel is its relative inexpensiveness, especially when compared to some more exotic drill bit materials.
High carbon steels have better tempers than low carbon steels, so they require less maintenance, such as sharpening, and hold their form and effectiveness longer. They can cut both woods and metals, and if available, are preferred to low carbon steels when cutting extremely hard woods.