13 mm countersink
FISCH TOOLS is the absolute leader in Europe when it comes to the production of drills in all forms, they make, among other things, everyone lives at FESTOOL.
Test by carpenter Søren Ulrich:
I have tested the sinks from Fisch in oak with fine results. Use the countersink before drilling your hole and run at low rpm. If possible, use a pillar drill as it gives the best result, however, the countersinks can easily be used freehand as well. The countersinks are really sharp and will work well in most types of wood
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