As both pin chucks and pin vices are generally made from steel, constant exposure to moisture will cause rusting. This is easily avoided as the items are small and can be stored in a toolbox.
Vices that have nickel plating or are made from aluminium will be rust-resistant.
Drill bits used in pin chucks and vices are of a small diameter and, if too much pressure is exerted on them, will have a tendency to break.