CON00213-C-AC  Moose 1-3/8" 3-D antique copper plated finish screw back Concho.  All of our screw back conchos come with a M4-.7 x 4mm machine screw.
If your project requires a shorter or longer screw, here's a selection that might fit your needs. Available in 2.5mm 3mm, 5mm, 8mm, 10mm, 13mm or 15mm lengths.