Fowler Deep Throat Point Micrometer These micrometers are great for taking accurate thickness measurements of steel and plastic sheets and plates up to 1.7" thick, with a depth reach of approximately 3". Features include... 0.3" - 1.7" Measuring Range 3" Throat Depth 0.0001" Graduations Digit Counter with 0.001" Resolution Ratchet Thimble Carbide Tipped Measuring Faces Includes Case and Measuring Standard