Nice wheels for the price! Put it on a 7 x 3.5 x 4t workbench made out of 4 x 4 and .75 MDF and it's REALLY heavy What I would do differently is buy a pack of 2 swivel and 2 fixed but this product works perfectly and is highly recommended.
Pros
Hole Center Distance: 1.7" (44mm) x 2.8" (72mm). Mounting hole dimensions: 0.39" (10mm)