Galvanized R51N Diameter 51mm Self Drilling Anchor Pre-support Micropiles

Product Description: Self drilling anchor bolts are widely used as an efficient anchoring means, for drilling, grouting and anchoring in tunnel pre-support, slope anchor, mining, pre-support Micropiles etc. It is a kind of self drilling anchor. Grout slurry can be erupted out from drill bit, then it can fill surrounding drill hole and stratum fracture. It makes anchor bolt combine with surrounding soil texture, forms concrete column with steel pipe, and then has the effect of