Brake Caliper hardware Question

[Jngarcia6]

Afternoon everyone so I had a general question not sure if I’m posting it in the right spot but I’m looking at replacing the hardware on my front brake calipers and was wondering. What is the singular rubber boot in the middle of the picture I attached. I know what all the other clips and boots are for and they all come in pairs but this looks to be only one piece in the kit. I can’t for the life of me remember or imagine what it goes to.
Thank you for any help and assistance

 

[Tiha]

Would like a better picture but I wonder if it is a cover for the bleeder ***** on the caliper.

 

[Jngarcia6]

Unfortunately that’s the only picture they have for the hardware kit.
See I thought the same but why is there only one. Not sure if it’s a stock photo error, which experience has shown that they send what they show.
May just gamble it and see what I find when I disassemble