Stainless Steel Screw (rod) accurately machined. Brass body, dull nickel plated finish. 25 mm x 1 mm pitch. Screw Gauge or Micrometer most use in a physics laboratory in Bangladesh. But some industries also use this meter., Origin: China.S.T INTERNATIONAL Bangladesh is a Supplier and Wholesaler of Vernier Calipers in Bangladesh. We have digital Micrometer also.