This activity removes all permission assignment from list item, breaking list permission inheritance if necessary.
SharePoint Designer phrase

Parameters
Input parameters
| Parameter | Description | Example | 
| Current item | Item ID. If the value field isempty, current item ID will be used. | [%Variable:ItemID%], Current Item:ID | 
| Current list | Title or Url of chosen list. If the value field is empty, current list will be used. | Tasks[%Workflow Context:List Name%]/Lists/ Tasks | 
| Current site | The URL of a source SharePoint site. If the value field is empty, current sitewill be used. | https://contoso/SiteUrl; https://contoso/Sites/SiteUrl;[%Workflow Context:Current Site URL%]/subSite | 
Example
