Precision rolled rebar is a kind of special rebar with high tensile strength and yield strength. There are no ribs on both sides, which are often used in prestressed construction, bag anti-floating anchor construction, slope reinforcement and formwork drawing. Its force can only be applied in a straight line, not welded or bent. According to the usage scenarios in different fields. Ribless steel bars can be made of Mg (used for anchor bolts in tunnels and mines, used for drawing formwork), PSB (used for bridges and formwork), GR (special material) and other materials. Mg material is similar to rebar, including 335,400,500, etc. PSB market commonly uses 500,785,830,930, 1080, 1200, etc. Gr is made of special materials, including 550. At present, the minimum diameter of ribbed bars in China is about 15mm (consistent with the thread diameter of D 15 cold-rolled bars) and the maximum is 75 mm. The pictures of ribbed bars are as follows (finish rolled bars, anchor bars). In addition, rebar with different diameters can be divided into left-handed and right-handed according to different usage scenarios and different materials. Supplement: Pay attention to distinguish it from steel strand, steel wire, anchor cable and other materials.