Hello, I have seen DPNs sold in lengths of 5", 7", 8", and 12". What, when and why are the 12" length DPNs used typically? Is the final product normally a handbag, totebag, something along those lines (when using 12" length DPNs) and thank you. :?? (I believe I posted this in the wrong place, previously, I apologize - I am still trying to get the hang of this communication mode). :??