PIPING SUPPORTS STUD BOLTS M 20 [m] UNI 5534 ASTM A193 GRB7 249 M PIPING SUPPORTS STUD BOLTS M 30 [m] UNI 5534 ASTM A193 GRB16 5 M PIPING SUPPORTS STUD BOLTS M 20 [m] UNI 5534 ASTM A193 GRB7 192 M PIPING SUPPORTS STUD BOLTS M 30 [m] UNI 5534 ASTM A193 GRB7 3 M PIPING SUPPORTS STUD BOLTS M 16 [m] UNI 5534 ASTM A193 GRB7 9 M