Gongyan Technology is dedicated to manufacture rock reinforcement products, such as self drilling hollow bar, FRP rock bolt, mining friction bolt, etc. Self drilling hollow rock bolt (IBO rock bolt, self drill bar, geo-drill injection anchor, self drilling anchor bolt) has been always our main focus since our establishment, through the years of hard efforts on markets, we have established a long term relationship business with many clients both at home and abroad. Our target for business To ...