I lost the nuts from my Schaller strap locks over a year ago. Assuming the threading was common, I went looking for nuts and washers to fit, but fine-thread M10 is not an easy find when not buying in bulk.
These wheels threaded onto those strap locks on the first try, and the set-screw is a nice feature to keep them from coming loose. Highly recommended if you have some old Schallers with missing lock nuts.