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	Although it is described as W4 or W6 in the centering gauge, what is it about?
	The probe is φ10 as standard, but in case of W4 it is machined in two stages of φ10 and φ4. In case of W6, the position of φ4 is φ6. Both the concentricity with the shank is within 3/1000 mm. Measurement of narrow grooves is possible.
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