I almost bought a german etching kit just for the thuri, but it was $50 and its not too hard to find at minimum a 5". 5"x1"x1" ia one of my favorite sizes for finishers. I got an 8x2 surgical black but ive been thinking about getting a 5x1x1 cut by dan. If you chamfer the edges they slip in and out of a pocket smoothly, great for work. I got one of the black la lunes in that size and it perfect for touching up blades throughout the day at work. 10 strokes and my knife is shaving sharp again. It's not bad for chisels too but i can get a chisel shaving sharp(will treetop hairs) off my hard/ fine washita VERY quickly and it'll do the whole range of everything. White washitas are nearly impossible to beat, which is why i buy every one i find that isn't priced insanely(which the are plenty of insanely priced ones).wid, 4" is indeed a thuri. Probably from a carving kit a'la estima. Those were packaged with 4" thuri's.