Direct read 6" caliper offer sharp, clear graduations of .001" and .100" per one revolution. Knife edge contacts for both inside and outside measurements. Unlike vernier slide calipers, their inside measurement jaws can pass by each other, allowing internal measurements as small as .050-Inch. Ideal for gunsmiths, mechanics and tool-makers who need a long wearing, accurate tool. Comes with a fitted plastic case. FeaturesKnife Edge Measuring Contacts (both Inside and Outside) Thumb Operated Fine Adjustment Roll Lock Screws for Dial Bezel and Sliding Jaw Hardened Stainless Steel BarFitted Plastic Case IncludedDial Graduated in .001" of an inchBar Graduated in .1" of an inch0-6" Range