Draper expert metric external micrometers draper expert 46603 the draper expert metric external micrometer 025mm is an expert high quality and very popular precision external micrometer it has a brushed steel yoke and finished with a satin chrome thimble and sleeve the anvils have been carbide tipped for extra strength and reliability the blue enamelled frame incorporates heat plates lock and ratchet stop the range of the micrometer is 0 25mm with graduations of 001mm the microme