This is Hinge inserting machine for 4X4  4X3 Multi purpose ladders .
also called joint squeezing machine. 
The machine can change the mold to insert different ladder joints, 
it’s easy and simple to change inserting mold.
Use hydraulic power, foot pedal, convenient and safe.
Inserting mold can be customized according to the hinge, assemble two hinges in one time
Equipment can be customized model: hydraulic or pneumatic