Vernier Depth Micrometer, Range 0 to 4 In, Base Length 4 In, Number of Rods 4, Ratchet Stop, Rod Dia 0.177 In, Graduations 0.001 In, Steel, Hardened and Ground, Rods of Carbon Steel, Locking Clamp, Finish Satin Chrome, Meets/Exceeds Federal Specifications For Accuracy, Includes Spanner Wrench and Case