material:steel wire

opening size:19.05mmX19.05mm

wire diameter:2.2mm

weight:3.3kg/m2

surface treatment:galvanized

roll size:1mX20m

Common heights include 3 ft, 3 ft 6 in, 4 ft, 5 ft, 6 ft, 7 ft, 8 ft, 10 ft, and 12 ft, though almost any height is possible. 

Fencing usually comes in 20 rod and 50 ft rolls which can be joined by "unscrewing" one of the end wires and then "screwing" it back in so that it hooks both pieces.