This spring caliper is Designed for toolmakers and mechanics who require finer adjustment and better balance. Manufactured from high grade steel and have a spring joint for precision settings. Adjustment is made by opening and closing of the Legs by means of an Adjusting Nut. Polished natural steel finish.High quality made for strength and durability. Note- Photographs are for illustration purpose only. Actual item may slightly differ from the pictures shown. Scorpion is committed to providing the customer with the best source for value possible on the market. You will enjoy the quality, function and usefulness of our products.