Zckl

Hey guys I’m a little new to the rebolting world and want to take on a project of rebolting a climb in my local area with some old bolts. All the bolts looks like wedge bolts until the last bolt which is this thing… https://imgur.com/TssucW3 Not even sure what this is or how to go about replacing it/does it even need replaced. Any info or advice would be appreciated!