Hilti makes a version of this that looks identical. I think the first ones I ever saw were from Grattan.

I used to buy bags of these from Home Depot, but there were two problems: I thought they should cost less and the Phillips head bolts were made of soft steel such that the driving bit would sometimes slip out.

The thought then occurred to me, I'm doing this professionally, why not act like it? So I found a source for boxes of 50 Togglers without bolts, selling at a price well below the Home Depot bags of seven or so. I then bought several hundred each of different lengths of 1/4-20 hex head bolts to go with them. I always have Togglers and bolts with me. I added washers, nuts, and lock nuts to the kit and I'm ready for bolting or togglering.

My life was actually made easier by making up this kit because the worry of whether I had togglers was reduced to just keeping the kit box full of stock from my garage.