Counterbore with a slow spiral drill fitted. Tungsten Carbide Tipped for use in abrasive materials. Specifications • Shank Diameter: 1/4 hex • Dia Metric: 6.35 • Dia Imperial: 1/4 • Dia2 Metric: 15.9 • Dia2 Imperial: 5/8 • Cut Length Metric: 11
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