Depends what you use 'em for.

If it's to space coil springs by 50mm, maybe. If it's to light a fire with I doubt it.
 
As far as I know they are ok, keep thinking of buying them for mine Cheap way of get a little lift
 
must admit i used for them ages but it only gives the appearance of a lift thats it , serves no other purpose
 
They will get your truck away from the ground (fuel tank n chassis etc) but you wont gain articulation or off road capability
 

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