The material of the gauge is high strength stainless steel, then the ruler is not easy to bend and wear, never rust and it also ensure accurate measurement. Weld inspection ruler with fastening screws can be fixed at any point, then it is convenient for reading when you do the measurement the ruler surface is mechanical grinding, no glitches.Insize has the quality products made to international standards with full guarantee. Innovation by continually striving to improve and develop new products. Service and support to ensure you have trouble-free use of our products. High performance products at a good price.