I will explain the specifics of this bet below.
Basically when you wager on the don't pass or come line, you can use this free odds bet after a point has been established in order to get paid true odds. The don't pass/come bet is used in conjunction with the don't pass line bet or don't come bar bet. This is the best bet in the casino and my personal favorite. Payout Odds Table For All Craps Bets Dice Probability Odds and Combinations
