I don't know why it took me so long to buy this unit. I got frustrated with using plastic mollies and then it got looser when there was pressure. I would have to disassemble and tighten or replace the Molly and then reinstall the racks. Now when I attach towel rails or shower curtain rods, I know they'll stay tight and tidy. Simply insert Molly, slide it into the tool, pull the trigger and you're done. Very happy.