Was exactly what I needed.
My old blades for my Ninja blender froze and became immovable and threatened to burn out my blender motor, if I tried to blend anything with it. Despite having all of the product information for my Ninja Blender, the Ninja website didn't specify what other models of blades were compatible with my seven-fin blades. BlenderPartsUSA provided the specifications and images in the product description that were meaningful to my search. I found a suitable replacement and it works like a charm, so I won't have to buy a new blender.