... mount,Riser mount,Simper mount 4.Safe Shenzhen Plastic Blow Mould One Piece stadium seating arena seating chairs ... .SpecificationsBackrest: No backrest, Use HDPE as raw material, adopt blow molding craft. Drainage: Scupper design, no (seeper) because of ... rainwater. stanchion: Use high quality steel tube molding or aluminum precision die-casting, surface phosphated,electrostatic gush ...