This is a set of 5 hooks for picture rails from Tachikawa. Model number: VP-1A (for insertion after installation) These are the square-headed type for post-installation, not the round-headed type for pre-installation. I ordered these from the manufacturer a year ago, but they didn't fit my picture rails at home, so I'm selling them. They've hardly been used, but please be aware that they have been stored by a private individual, so those who are very particular about condition should take caution.