One of our most popular items is the 10 piece nut file. The sizes are .010/.013/.016/.024/.028/.032/.036/.042/.046/.056. You can buy them as a set of 10 or each file separately. These files have a very high quality file with twin cutting edges with rounded profile that produce a clean and accurate string slot. You can get any of these items at www.philadelphialuthiertools.com. We ship all orders next business day if not sooner.