Vocabulary word: bunch of keys
A key is a metal instrument used to open a lock. A key consist of two parts:
a) the blade, which slides into the keyway of the lock and distinguishes between different keys
b) the bow, which is left protruding so that torque can be applied by the user.
It is common for people to carry a bunch of keys they need for their daily activities around with them.
Below is a video of a key cutting machine.