Galvanized steel and 1/4 inch
Looks like almost a quarter inck.
yes they work well for me but be aware of your angle versus the head height. they can pivot only so far. my rise and fall is about 4-5 feet yearly and I have had no issues. (spring versus summer)
if you put the male on one end and the female on the other dock part I had no issues lining them up. there is some degree of latitude built in. Approx. 1/4 inch within the pivot side to side. Good reason to get their dock pins to lock them together.