Review on Prime Line 9071456 Shields Short 20 Pack by Jerardo Phi

I have a small wench that I need to use in various places where only concrete is used as a floor. I bought these Lag Shields and they hold a 3.5 foot x 2" x 8" slab that I installed on these concrete floors. These lags are great so far. I drilled a hole, put in the grommets, then screwed in the screw and these grommets expanded and held up very well. When I'm done, I remove the bolts and go to another location. I leave the screen protectors in, but cover the holes with a very small piece of black tape to keep dirt and dust out. The lifting weight for me is 50 pounds or less. My situation is different, most jobs require the bolt to be permanent and I find this is a great solution for that too.