These are very industrial looking casters that I retrofitted to my large stainless steel grill. I used to have 2 inch soft rubber casters that didn't ride over aggregates or other bumps at all. They are much larger and have much less rolling resistance. In addition to the wheel's heavy tire compound. the entire wheel is wider than Harbor's competitor solution. I think my 4" trail is over an inch wide compared to Harbour's .75 or something. Moving my heavy grill over a bumpy patio is no problem. Works well and looks great!
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