This is a Hunter Douglas cord tilt mechanism for Country Woods 1″ wood mini blinds.
It fits into a headrail that measures 1″ by 1 1/2″ and has a 3/16″ notched chevron-shaped hole.
It comes pre-strung with 1.2mm white string that hangs down 36″.
Tassels for the end of the cords are available separately here.
Clear and white plastic.
Sold individually.
Hunter Douglas part # 5004810000.
This is a discontinued part, and only a limited quantity is available.