This cord lock mechanism is for horizontal 1" mini blinds. It fits into a punch in the headrail that measures 9/16" by 1/2".

Durable all-metal rollers and locking device.

Works for both the left and right sides.

This lock does NOT come with the wire guide that separates the strings. The picture of the lock with that guide is only for identification purposes. 

Silver.

Sold individually.

Manufacturer part # 5003363000.