Helix The Helix 12" Extra Large Red Cash Box is a sturdy, large Capacity cash box for domestic or office use. The Cash box is secured by a key lock supplied with two keys and includes a recessed carry handle and rounded corners. The internal coin tray is removable and spill resistant when used in transit. The Helix Extra Large Red Cash Box is ideal in the home or office as a petty cash tin for receipts, coins and cash.