You show a cute little briefcase made of polished wood with a close-up mat on top of it. You can take out your close-up props from this briefcase and freely show the briefcase at all times. As a finale for your close-up performance you take a nut and a bolt and place it on the briefcase. On your command the nut will thread itself onto the bolt (even covered with a glass) and on your command, the nut will unthread itself from the bolt. The nut and bolt can be handed out for inspection at any time and you can freely display the briefcase at all times. Everything is self contained and automatic no need of any sleights of hand or palming or switching or anything like that.
The cute little briefcase measures around 6.5" x 10" and if you are table hopping this mini briefcase can hold all your props.