Premium material - This is a outside micrometer set with measuring range between 0 and 0.0001". Made of high quality cemented carbide and cast iron, these outside micrometer are sturdy and durable. | Precision Machinist Tools: It has super high accuracy of 0.0001'', Micro-lapped carbide tipped measuring face gives mirror finish on the measuring faces to make more accurate reading. | Package Include: 6 pcs outside micrometers(0-1", 1-2", 2-3",3-4",4-5",5-6"), 5 pcs calibration standards and 1pc adjustment wrench all packed in a suitcase | Ratchet Thimble handle for precise application of force. It comes with a sturdy case for quick access and protection! | Applications - Widely used for precise measurement of length, diameter or thickness.