Spare iron blade for Quangsheng Luban No 4 or No 5 planes

This iron fits the Quangsheng Luban No 4 and 5 hand planes.

It is 3mm thick. This, paired with the heftiness of the Quangsheng Luban planes, helps reduce chatter and makes planning easier than with other planes.

Furthermore, the high carbon steel of which the irons are made means the blades get a truly sharp edge that is difficult to get with most other steels.