This is what I bought
SQUARE U-BOLT
Galvanized
t's New and Includes Two 1/2" Hex Nuts, Two Spring Washers and Two Flat Washers
Suitable for 3" Square Pipe
Thread Dia & Pitch = 1/2" - 13
Inside Width = 3-1/8"
Inside Length = 4-3/8"
Threaded Length = 1-1/2"
Grade 5
They actually look more like this finish
