A person sorts through a box of screws and nails and drops a screw on the floor.
A person going through a box of screws and other small objects and a single metal piece being dropped. A person searches through a can full of beads and one drops on the table. A person sorts through a box of screws and nails and drops a screw on the floor. Someone is digging in a can of beads and one falls on the table. Someone is looking through a box of nuts and bolts.