There are a collection of tools on this image. On the left is the Debur tool that is used to clean out holes after drilling. In the middle (top) is the flush rivet set that is used to rivet flush rivets on the skins. The middle (bottom) is a go-no/go guage set for standard rivets to verify that you have set them correctly and the tool on the right is a back rivet set for setting rivets from behind using a steel plate as a bucking bar (on the flush surfaces)
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