I bought these for my Demko AD20.5. They are well made and were a perfect fit in the knife. The overall diameter is slightly less than the stock bearing washers, though. And that's my only complaint, really. There's plenty of space in the knife to double the surface area on these washers. I bought them to make the knife even more solid feeling, but with the overall diameter being so small, my knife has just the slightest side-to-side play that I can't get rid of without overtightening the pivot. The thickness and pivot hole size should stay as they are, but I think the surface area could be doubled by increasing the diameter. Thanks for the quality product and fast shipping.