Self-locking steel clamp fits I-beam flanges:
SA-1039 fits 1 1/2 to 4 in. (38 to 101 mm) wide
SA-1040 fits 1 1/2 to 8 in. (38 to 203 mm) wide
SA-1039 fits 1 1/2 to 4 in. (38 to 101 mm) wide
SA-1040 fits 1 1/2 to 8 in. (38 to 203 mm) wide