kilos are a type of self-service restaurant where clients serve their own food from a variety of tables offering different plates, then they weigh the plates and get billed accordingly - kilos often offer a 'fixo' rate, which allows for unlimited servings at a fixed price -  normally this rate is not plainly visible or advertised and must be inquired about.

most kilos have a basic churrascaria as well, offering a nice variety of meats - these cuts are usually located separately from the main food tables, and meats are cut and prepared to order. 

high-end kilos also offer sushi as part of the buffet - additionally, they can offer sashimi of salmon or tuna, but these must be specifically asked for, weighted on a separate dish, and billed at a higher rate.

all kilo restaurants in rio de janeiro are more expensive during weekends and holidays.