U-steel support is a kind of passive support of coal mine support, the tensile strength and the compressive strength is higher, it also has good toughness properties Material: 20Mnk Size: 29U Specification: single beam, double beam, treble beam, grade beam We can supply the products with high quality and competitive price, if you are intrested in our products please visit the website:https://www.zxminesupport.com