Standard Pack = 1 piece(s). Type = Disc Micrometer ; Range = 3 - 4 Inch ; Graduation = 0.0001 Inch ; Accuracy = 0.0002 Inch ; Flatness = 0.00004 Inch ; Features = Hammertone Blue Baked Enamel Frame Is Tapered For Hard-To-Get-At Places, Anvil And Spindle Are Hardened And Precision Ground With Microlap Finish On Measuring Faces, Positive Lever Locking Clamp, Quick And Easy Zero Adjustment On Sleeve, Ratchet Thimble For Repeatability, Meets Or Exceeds Federal Accuracy Specs, Sizes Over 1 Inch Include Standards ;