What is the ruling of Islamic law regarding the work of a Muslim carpenter in a non-Muslim country, making home bars for non-Muslims, which are used for drinking alcohol and other beverages?

It is not permissible to work in the manufacturing of bar counters if their predominant use is for drinking alcoholic beverages, due to it being cooperation in sin. However, if their predominant use is for permissible purposes, then there is no harm, except for someone who is known or thought to intend them for drinking alcoholic beverages.