This adapter converts 4mm bits to ¼ hex bits. This bit is built rugged to the point that the limitation of torque comes down to the type of plastic. The failure point comes to the 4mm hex as it is the smallest part and cannot be thickened any farther. I strongly recommend a more durable plastic such as PLA CF or PETG and so on. Be sure to print the model sideways to allow the layer lines to run through the part and reduce likelyhood of sheering the layer lines.
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