Generally, unless otherwise specified, the ring tying machine refers to a 3: 1, 3: 1 which can be understood as an A4 format (297)34-hole or 33-hole ring tying machine, such as Jindian ring tying machine GD-6800；; ;

There are also 2: 1 iron ring binding machines, which can be understood as A4 format (297) 23-hole or 22-hole iron ring binding machines, such as silver diamond binding machines.