Mechanical 3-Point Inside Micrometer, Range 4 in to 5 in, Resolution 0.0001 in, SPC Output No, Movement of Screw 1 in, Inside Micrometer Type 3-Point Inside Micrometer, Number of Measuring Rods 0, Number of Micrometers 1, Operation Type Mechanical, Thimble Type Ratchet, Case Included Yes, Contact Point Material Steel, Contact Point Shape Curved, Features Self-Centering Contacts, Furnished Micrometer Bore Gauge, 3 Point Contact, Included Certification Declaration of Conformity