Excellent! Simple, cheap & small (unlike CryptoSteel), durable, and the seed words are not in plain sight unless you unscrew it. Make sure you use stainless steel to avoid (mind)rust. For those who don't know/understand how it's done, you just punch or permanently engrave/etch the first 4 letters (no need for more) of each of the seed words on each of the washers, lock them tightly in the screw with the wing nut, store it somewhere safe, all done!

Very important warning: when punching the 4 letters of each word on each of the washers, make sure you also punch the seed index of each word/washer (i.e., its order position in the seed). If you don't, and you just rely on the washers being arranged in proper order in the screw, you may mess things up if you or someone else unscrews it and the washers fall off. If the order is lost, the seed is also effectively lost.