"Dasqua 0-1"/0.001" Micrometer Head ~ Quick and easy adjustment. ~ Flat, lapped face. ~ High precision spindle. ~ Easy to read. ~ Satin chrome, low glare finish. ~ Rust resistant. ~ Ratchet thimble. ~ Hardened ground and threads for consistent repeatability and accuracy. ~ Accuracy is .0015". ~ Used for improving accuracy in machines, gauging, test equipment, electronics, optical instruments and machine instruments. ~ The mounting piece is 10mm and the spindle is 6.5mm."