We had class IV forks that are 5" wide so these fit perfect! To be honest we didn't think it would as heavy duty as they were due to price but they are good quality for the money. Gave it 4 stars only bc they did bend a little when trying to lift a 2+K payload. Would definitely recommend these but my advice to you is NOT to go past 50% or your original forks. Ours are 46" and we used the 84" extensions and it works fine but you will bend the ends if you do what we did or you have shorter forks. Other than that they do the trick... Bent alittle but came back into shape for the most part when the weight was removed.
mike sesty 
