for micrometers from 25 - 50 mm up an essential accessory for accurate setting of the Instrument. Measuring surfaces hardened and plane parallel lapped.
25 mm: round measuring disc of steel
from 50 mm: round sticks with insulation handle
Measuring surface: Up to 275 mm - 6,5 mm diameter. From 300 mm up - 10 mm diameter.
Length: From 25 up to 975 mm raising in 25 mm intervals
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