High Speed Steel Bi-Directional Mortise Bits are designed with two flutes for right and left hand cutting. They are used in oscillating mortising machines to produce clean slots by oscillating cutting strokes. They are also known as Reciprocating Slotters or Oscillating Mortise Bits. They are also known as Reciprocating Slotters, Oscillating Mortise Bits, Mortising Router Bits or Multi-Directional Mortise Cutters.