http://www.metanchor.com.cn/se....lf-drilling-anchor-p Introduction 
Domed Self-drilling Anchor Plates are complementary to the Dome Ball and overcome the problems of surface angularity. They allow the development of a good torque tension ratio.
    
 http://www.metanchor.com.cn/se....lf-drilling-anchor-p Introduction 
Domed Self-drilling Anchor Plates are complementary to the Dome Ball and overcome the problems of surface angularity. They allow the development of a good torque tension ratio.