These units have been designed to lockout electrical panel buttons and switches with no inbuilt lockout provision.
Working in a two stage operation, the base plate should be attached directly onto the electrical panel over the top of the relevant switch using the adhesive backing.
When in place the unit can then be isolated by placing the house unit over the top of this, preventing access to the switch.
This can then be locked in place with a padlock (supplied).
The circular units are designed to fit over push / mushroom panel buttons, and the square units for switch levers.
The two types of square units allow for handles which may extend outside of the house unit and different angles.