My catalog, Drawing C630625-R9 specifies: Rohn 25, Per leg, SAE Grade 5, 3 1/4 in Dia x 1 1/2 in long (NF) 3 5/16 in Dia x 1 1/2 long (NF) Drawing C630645 R 10 specifies: Rohn 45, Per leg, SAE Grade 5, 3 5/16 in Dia x 2 3/8 in Long (NC) 3 7/16 in Dia x 2 1/2 in Long (NC) Hope this helps. Bruce AA4Z