Our High Spiral Flute | High Speed Steel | Construction Reamers are good for most general purpose applications, offering a combination of hardness and toughness for wear resistance. Combination black and gold finish, for improved lubricity, corrosion resistance, and to reduce chipping or flaking. These round shank tools have flats ground onto three sides to reduce slippage of the bit when used in drill chucks. When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging. Our High Spiral Flute | High Speed Steel | Construction Reamers is especially adapted for heavy duty reaming as encountered in the fabrication of structural steel assemblies.