This is a little Dice Jail for the bad rolling Dice I designed. It fits 3 20 sided Dice (d20). When using with 3 d20, the Dice can't move. If used with 2 d20 the dice can move freely in the Jail. The top part is a little tight at the first time. Once inserted and rotated it works very fine. The top part can be rotated by 90 degree to "lock" it.