Blades of cutters can be rotated through 180 degrees to give one new cutting edge. Specifications • Shank Diameter: 1/4 • Dia Metric: 12.7 • Dia Imperial: 1/2 • Cut Length Metric: 8 • Overall Length Metric: 57 • Bearing Dia Metric: 12.7 • Bearing Dia Imperial: 1/2 • Angle: 90