Column bets are a type of outside
roulette bets that are located at the bottom of the table, below the individual numbers. There are three seperate column bets available and each bet corresponds to the entire column of numbers above. Usually the column bet boxes have the words "2 to 1" written in their betting area.
Column bets pay 2:1. If you placed a $5 column bet on the first column of numbers and any of those numbers hit, you would be paid $10.