Bishwakarma (Nepali: विश्वकर्मा) is an ethno-linguistic
caste belonging to blacksmiths. The 1854 Nepalese Muluki
Ain (Legal Code) not keep in lowest category. Kami are categorized
They live in Nepal, Sikkim and Darjeeling District of West Bengal, India. Kamis are essentially blacksmiths Kami/Vishowkarma and Vishowkarmabramin.are scattered across almost all hilly districts of Nepal, districts of Sikkim, Darjeeling (a District of W.B), and Assam; some have settled in other parts of India as well. They are also known as Vishwakarma or Bishwakarma.
The Kami are traditionally held to be the descendants of God or Lord Vishwakarma. They are one sub-caste from other Vishwakarma sub-caste to kami they have their own identity and occupation and language. The word kami may derive from the Sanskrit word karmaor kam, meaning “work”. The Kami make the famous Khukuri knives used by the Gurkha Army, and a traditional Nepali drum called a Madal. They are also expert performers of the traditional folk dance Maruni Nritya.
Source : Wikipedia