Rebar tying has come a long way over the years. It used to be done all by hand with a pliers or with wire ties and a hand spinner. We have moved to rebar tie guns. We use Max brand guns. We started out with the basic single wire tier but moved to the Twintier. The Twintier can do a lot more ties with one roll of wire, ties much tighter, and is way faster then the single wire basic model.
Alden's Blog 