Overall a great seller and purchase. I use them on steel (mostly), wood and plastic and since I bought them they have saved me a lot of time (due to over-sanding). They are excellent for smoothing out pitting, shaping and finishing small welds and other repairs. Not much larger than a large pencil, they are designed for fine work in small areas; If you want to smooth or sand large areas, this may not be exactly what you need. I see it as a must-have for crafting. Modelling, anything that…