Set includes six micrometers. Standards and case. Precision ground carbide anvil parallel to .00005 inch. Improved accuracy to .0001 inch graduations. Ratchet stop for exact and repeated readings. Positive spindle lock. Hard chrome plated, anti-glare satin finish sleeve and thimble. Special heat insulated alloy stabilizes measurement accuracy. 5" and larger micrometers feature tubular light weight frames for handling ease. Micrometers also sold separately.