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In this video I show what types of keys there are, key markings (what the numbers on the key mean), which key will unscrew which screw and how to deal with a screw with a damaged head. Table of contents: 00:00 - introduction 00:14 - comparison of keys 00:34 - types of keys and their applications 3:56 - inch wrenches 4:49 - key markings 6:02 - which flat wrench will unscrew which screw 7:24 - what to do when the screw head is damaged I encourage you to watch the whole video :)