The Starrett 63 Micrometer Head features 0-2" range, .0001" graduation, ratchet stop, and lock nut. 0-2", .0001" Grad with Ratchet Stop, Lock Nut. Includes Carbide Contacts.
The Starrett 263 & 263M Micrometer Head features ratchet stop, lock nut, and carbide face. 0-25mm Range, 0.001mm Grad, Ratchet Stop, Lock Nut, Carbide Face.