Well i can assure you that i've used them on my 37" LCD samsung tv and they're more than up to the job, it's been there for about 4 fucking months so i think it'll be ok.... Ok it my not be ideally suited to a 50" plasma but thats your decision, i bought them purely on the description on the pack after having looked at several other options, they are for "Heavy Duty" use, wtf does that tell you.