Hollow Against Center.
This is a hollow against center with a centre point and a pressure ring. The advantage of using a pressure washer is that the wood does not split when it becomes thin. Something that often happens with the standard against centers. Additional to this counter center is that it is hollow. It can be drilled through the counter center. The holes on the side of the counter center serve to unload the drilling flour. This counter center has a Morse Cone 2 for inclusion in the shaft.
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