These simple washers are Safety Cord Stops for horizontal wood, faux wood, Venetian, and mini blinds. They are also used on Roman and woven wood shades that have exposed string on the backside of the shade. 

One washer ties to each lift cord, preventing the lift cord from being pulled through the slats on the blind or from behind the shade. This helps prevent a dangerous loop from forming, which can be a potential strangulation hazard. These items are also called Inner Cord Stop Devices.

The outer diameter is 9mm or 3/8", and the inner diameter is 3.4mm or 1/8".

They can also be used on split stack vertical blinds to help secure the lead carrier. 

Clear plastic. 

Sold in packs of 4.

View installation instructions.