Features: - Unique split-tip design penetrates through steel faster - Resists walking or skidding, even on round surfaces - Balanced, double-flute construction requires less pressure, does the work for you - Designed and manufactured in USA. -Capacity : Cut Up Through 3/8 IN (9.500 MM) Mild Steel, Copper, Brass,Aluminum, Wood, Plastic and Laminates - Hole Size : 1/2 IN (12.700 MM), 7/8 IN (22.200 MM), 1-1/8 IN (28.600 MM) - Maximum Material Thickness : 10 GA (3.500 MM) - Minimum Chuck Size : 3/8 IN (9.500 MM)