The Endurance On-Off Perforator has carbide welded to the outer surface.  Allowing for higher and longer flow rates without damage to the tool.

The On-Off Perforator allows the operator to run a BHA into a wellbore circulating without restriction down the tool-string.  When the operator decides to switch operations to the Abrasive Perforator, a drop ball is pumped to the BHA, shifting the flow, this stops all fluid flow below the Perforator.  Once the abrasive perforating operation is completed, a second drop ball can be deployed to the BHA, this changes the fluid flow path again, stopping flow to the Abrasive Perforator, back through the tool-string below.

This tool is typically used for Confirmation/Milling runs, where the operator may wish to have the option to cut a perforation interval at the toe of the well, and still have the milling BHA operational while POOH without having to make a second run to TD.