How to choose the best human claw machine?

1What is standard size? Other size can customize? 3*3*3m is standard size; Other available size: 4*4*3m;4m*4m*3.5m; 4m*4m*4m; 5*5*3m; 5m*5m*3.5m; 5m*5m*4m; 6m*6m*3....

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