Core Bore 15479 Heavy-Duty Orange Wet Core Bit 2"Our most popular core bit, Heavy Duty Orange gives excellent footage and drilling speed. Designed for applications with light to moderate steel, Heavy Duty Orange is the best bit in the industry. Highlights: General purpose Heavy duty orange Diameter: 2" Heavy duty bit has a high diamond concentration for excellent footage and drilling speed. Used for all types of wet drilling in applications with light to moderate steel.