1.FRP(GRP) rock bar spherical dome nut 2.High loading strength 3.dia 20,22,24,32,36,40 4.fiber glass & resin 5.hex 1.FRP(GRP) rock bar spherical dome nut2.High loading strength3.dia 20,22,24,32,36,404.fiber glass & resin5.hex FRP(GRP) All-thread rock bar spherical dome nut