Attached photo is the throat depth of 400 ton press brake.it is about 300 mm. as you said,it is connected with two press brake machine and used to bend very long pole,for example, MM or MM.here,we would like to tell buyer that they should tell us what parts you want to bend,so,we can check if the specification is suitable for you.the regret thing is that you bought a wrong machine but cost all money of you.

    Press brake throat depth also has a impact for your bending ability.because you have been limited by throat,take a example of above 300 mm,that is to say that your radius only can reach 300 mm when you bend 2500 mm sheet metal.if you want no limit for 2500 mm,you should choose 3200 mm bending machine.but very less buyers has interest for this,because they do not want to bend so deep when they bought machine.we also can not say too much in case the buyer would be boring for your manner.