Stainless steel chrome-plated, the whole high-temperature quenching treatment, high hardness, . Wear-resistant, anti-rust, good resilience, beautiful appearance, high precision, good toughness, smooth surface, to meet your needs. The stainless steel pressure gauge is coated with anti-rust oil for long service life. The 360-degree swivel design allows you to easily unfold or fold it and take it with you. The specifications of each blade are clearly marked on the surface with technology, allowing you to easily and easily identify the blade you need. The blade guard has a thumb notch for easy access. Radius gauges can accurately measure internal and external threads, with threading inserts of different sizes; convex pattern for detection of concave arcs, concave template for detection of convex arcs. Widely used to check the correctness of the dimensions of drill bits, screws, molds, fasteners, valves, bearings, etc., and to find out the type of replacement. It is used to check the angle of the tool when cutting threads on metal lathes, and to accurately measure the internal and external threads of threaded inserts of various sizes., Manufacturer: ZKLGS