I wouldn't trust them. The 300 kg rating is stationary support. If you have to bail, they'd have to withstand the force of stopping the weight, too. Plus I'm guessing it's 300kg per pair, not each. And those stabilizer legs on the bottom look weak.
I don't know what "pallet racks" are in Polish, but here's a link to the English Wikipedia for them: Pallet racking - Wikipedia, the free encyclopedia
In the States, you can find used pallet rack components fairly cheaply, and they're strong as hell. You could probably find some used on Allegro or Gumtree, or some other B2B site that are as cheap as those sawhorses, yet much stronger.
300kg is per one unit. producer claims it is very sturdy and solid. and they would serve me primarily as some sort of "assurance" that i dont get stuck under heavy barbell during bench press or squat
ive searched many many shops etc. and found only these ones. they are adjustable so it is an another upside
hmm i confused right now since i was going to buy them
I used to use them when I was benching and squatting...they actually probably saved me from serious injury one time. Each one had a 1,000lb capacity, I was squatting about 185 and I just lost my balance completely for almost 2 feet down...they fell on the saw horses and my lifting partner was able to steady the weights before they could roll anywhere.
I would definitely say they are better than nothing. Obviously the higher the weight, the farther they may fall the less use the saw horses will be since they cannot withstand much pressure, but in my opinion they are worth a shot.
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