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The term "box" tells the mutuel clerk that you want all possible combinations of the horses selected in wagers such as exactas, trifectas and superfectas.
Example: Tell the clerk, "Give me a $1 trifecta box numbers 1, 3, and 7. If you box your selections, as long as the horses you have picked finish first, second, and third in any order, you win.
As the number of horses in the bet are increased, the key and box bets can quickly become very costly:
| Number of horses in box | Cost for $1 bet |
| 3 | $6 |
| 4 | $12 |
| 5 | $20 |
| 6 | $30 |
| Number of horses in box | Cost for $1 bet |
| 3 | $6 |
| 4 | $24 |
| 5 | $60 |
| 6 | $120 |
