The square is 5/8” and they are very plain except for the decorative bullet toggle. Made by Krementz and you could have your initial engraved on front. The picture doesn't do the links justice. They are shiny on front and the picture makes them look dull.
All my cufflinks and jewelry are sold in used, pre-owned condition. Vintage and Antique items by nature have some wear, imperfections and signs of use and age.
Polished Silver Toned Square Cuff Links Cufflinks