These are useful little magnetic studs, ideal for using to close handbags and cases. They're simple to fit with no specialist tools - just cut two small slits for the legs of the stud (always reinforce fabric and thin leathers before cutting!!) and fold the legs over the backing button for a secure fit.
This is a pack of 5 magnetic poppers in the larger of two sizes. They measure 3/4" (20mm) across and the 2 prongs on the back are 3/8" (10mm) apart.