Corrections Officers are often required to search inmates and the various areas of the correctional institution for any items that may be considered dangerous or that are not permitted. In making a routine search, officers should not neglect to examine an item just because it is usually regarded as a permitted item. For instance, some innocent-looking object can be converted into a weapon by sharpening one of its parts or replacing a part with a sharpened or pointed blade. Which of the following objects could most easily be converted into a weapon in this way?