This was a replacement for an original cutter blade that cracked after years of use. This part fit perfectly and restored like-new blending and chopping to my Cuisinart blender. It even came with the rubber gasket.
I'd recommend hand-washing the blender base and cutter blade, since the original one probably cracked due to the drying heat of my dishwasher. Just be careful, though, since this thing is really sharp!
Great replacement part to keep your blender working like new.
*** Update after 4 months of use ***
The cutter blade is having similar problems as my original Cuisinart blade - it's starting to get really tight in the shaft (huh, huh!) and doesn't spin as freely as when new. I think this is due to a couple of runs in my dishwasher. DON'T WASH THESE BLADES IN THE DISHWASHER - WASH THEM BY HAND FOR MUCH LONGER LIFE.