Highlighted areas for use with 531, 541 and 500B 1/4"-1" Die Heads. Non-highlighted areas for use with 532, 542 and 500B 1 1/8"-2" Die Heads. For metric high-speed rebar dies, Series B, ISO, see price list. Dies for Rebar, for use in 500B, 531, 532, 541 and 542 Die Heads. Catalog Nos.