Can you please specify the material of the rods?
For example, it is material xy, see for example the marking below
1.4301 (AISI 304)
1.4305 (AISI 303)
1.4404 (AISI 316L)
1.4541 (AISI 321)
1.4571 (AISI 316Ti)
1.4401 (AISI 316)
1.4435 (AISI 316L)
1.4539 (AISI 904L)
1.4016 (AISI 430)
1.4021 (AISI 420A)
1.4034 (AISI 420B)
1.4057 (AISI 431)
1.4104 (AISI 430F)
1.4112 (AISI 440B)
1.4841 (AISI 314)
1.4842 (AISI 309)
1.4845 (AISI 310S)