The drill bits in these sets have a black-oxide finish that retains lubricants to improve the bits' wear resistance and chip flow. Black-oxide bits should only be used for drilling ferrous metals. High-speed steel drill bits provide some flexibility and absorb some shock and vibration.

• Drill Bit Sizes Included - 1/4 in; 5/16 in; 3/8 in; 7/16 in
• Smallest Drill Bit Size - 1/4 in
• Drill Bit Point Angle1 - 35 °
• Includes - 1/4 in, 5/16 in, 3/8 in, 7/16 in
• Largest Drill Bit Size - 7/16 in
• Country of Origin - Taiwan