Garzo or blacksmithing produces iron goods such as farm tools, knives, swords, horse shoes and bridles, metal tips for arrows, ploughs and utensils. The 14th century Buddhist saint, Dupthob Thangtong Gyalpo, is credited with introducing the craft of ironworking in Bhutan. He was a master engineer who forged iron chains linked to form bridges over rivers and gorges. Legend says he built eight such iron suspension bridges. One such, the Tachog Lhakhang Zampa, spans the Paro Chhu river, enabling pilgrims and tourists alike to crossover to the temple of the same name. We can see the remains of another such bridge of chains at the National Museum in Paro.

Though there are few remaining blacksmiths in the country, Tibetan settlers in pockets of eastern Bhutan still practice the craft. Wochu village in the Paro district is also famous for ironwork; the smiths there are known for their exquisite ceremonial swords known as patang.