Starrett vernier calipers measure internal, external, depth and step dimensions up to an accuracy of 48 inches. These calipers feature hardened stainless steel construction offering resistance against wear and a fine-adjust screw for accurate measurements. They come with a locking screw for the sliding jaw to secure the item tightly in place for an accurate reading. These calipers are marked with sharp black graduations on a satin-finished bar to provide easy readings. Choose from a wide range of vernier calipers including imperial and metric scale readings on Raptor Supplies.