508S-007M, 7pcs/set HSS Solid Capscrew Counterbore Sets, 3 Flute, Metric CNC Tooling 217" 21/64" 5/16" 3-1/2" 1/4"

217" 21/64" 5/16" 3-1/2" 1/4" 9/32" 13/32" 3/8" 5" 5/16" 11/32" 1/2" 7/16" 5" 3/8" 13/32" 19/32" 1/2" 6" 1/2" 17/32" 25/32" 3/4" 7-1/2"

and from internal to external by simply changing the feeler

Hardened and stabilized

1 reamer hole 3/8" diameter

508S-007M, 7pcs/set HSS Solid Capscrew Counterbore Sets, 3 Flute, Metric CNC Tooling 217" 21/64" 5/16" 3-1/2" 1/4"HSS SOLID CAPSCREW COUNTERBORE SETS, 3 FLUTE, METRIC, #508S 007M Metric Set (7PC): M3, M4, M5, M6, M8, M10, M12 3 Flute High Speed Steel Straight Shank Shank sizes: M3 5. 5mm . 218", M4 7. 9mm . 312", M5 7. 9mm . 312", M6 12. 7mm . 500", M8 12. 7mm . 500", M110 12. 7mm . 500", M12 15. 8mm . 625" Screw Size Pilot Diameter Cutting Diameter Shank Diameter Overall Length M3 3. 4mm 6mm 7 32" 3" M4 4. 5mm 8mm 5 16" 3" M5 5. 5mm 10mm 5 16" 3 1 2" M6 6. 6mm