Description: The item is made of stainless steel material, anti- rusty, good elasticity and high strength.Typically used to check the thread size determination is correct. Features: 30 pcs screw thread pitch US system. 58 pcs screw thread pitch US system + metric + inch . Typically used to check the thread size determination is correct. Notch design, when used in the gap at the tooth can be rotated dial toggle, easy and convenient. Special measuring tools, thread pitch for inspection. Can be used for measuring the US system. Thick forging products, single thickness 0.5mm, easy to wear, longer service life. Clear scale: Specimen scale scale clear, at a glance, easy to use. Specifications: Color: Sliver, Material: Stainless steel Size: As picture shown Package Included: 30 x Center gauge 60 ° US System Or 58 Blades Set Whitworth & Metric + Inch System + Whitworth Gauge Notice: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures.