Counterbore with a slow spiral drill fitted.
Tungsten Carbide Tipped for use in abrasive materials.
Specifications: • Shank Diameter: 1/4 inch • Dia Metric: 4.
75 • Dia Imperial: 3/16 • Dia2 Metric: 9.
5 • Dia2 Imperial: 3/8 • Cut Length Metric: 8