The Regular Lock measures 3cm x 1.5cm with a thickness of 4mm Closure is 6mm. Fits best on all stone or pearl necklaces, and a variety of our thicker chains and bracelets. Can be hand or machine engraved. Hand engraving is priced on a case by case basis. Please email us to coordinate any hand engraving requests at info@marlaaaron.com. 14k Gold 18k Gold and Platinum are available by request. Please email info@marlaaaron.com with inquiries. How We Engrave #marlaaaronjewelry #lockiton #regularl