The most popular precision micrometers used by skilled workmen worldwide. Accurate, rugged, and easy to use. Protective case keeps micrometers and standards together, readily accessible. Hard and stable one-piece friction thimble permits one-hand operation of micrometer and uniform contact pressure. Balanced frame and thimble design ensure easy handling. Micro-lapped measuring faces. Starrett No-glare satin chrome finish on thimble and sleeve minimizes annoying surface glare under bright lights and resists rust. Anvils sized at .250" (6.35mm) diameter.