Tachikawa Picture Rail Hook VP-1A (Rear Loading)

Set of 5 picture rail hooks from Tachikawa.
Part Number: VP-1A (for rear insertion)
This is the square-headed type for rear insertion, not the round-headed type for front insertion.

I ordered these from the manufacturer about a year ago, but they didn't fit my home's picture rail, so I'm selling them.
They have been used very little, but please be aware that they have been stored at home and may not be suitable for those who are particularly meticulous.