... service Professional technical team First-class leadershi sub-frame type of high mast lights:1.Shape:Conoid ,Multi-pyramidal,Columniform,polygonal ... (other materials are also avaliable on requesr) 3.Jointing of pole with insert mode,innerflange mode,face to face joint ... mode .4.Design of pole :against earthquake of 8 grade ,aganist wind pressure of 1605.Minimum yield strength:355 mpa6 ...