So, you don’t need to worry about what size it comes in, or look for them on E-bay. I have more than 3-400 hundreds of heel and sole edge iron myself, but I still found it extremely useful. I came across it in a French tool collection (bought it instantly), and asked my toolmaker to make an exact copy. This is a prototype and already available on cordwainertools.com’s list. Cool stuff, a must-have.