Feature : (1) The bolts have high strength stress ,good support capacity can prevent the roof from sinking down ,and the strata sliding . (2) Fast and easy installation by mechanized tools. (3) Be used with resin anchoring cartridge for permanent support . (4) Be used in high stressed ,large deformed area . (5) Low price, widely used in coal mines, railways, hydropower and other types of roadway projects. (6)Thread profile has higher strength than rod and offers excellent mixing capabilities in resins installation