The Babylock is most popular lock--used as a connector, a clasp, a charm holder and for many, the very first lock that they purchase. It measures 1.5cm x 9mm with a thickness of 2mm, closure is 4mm. The Babylock fits on all chains, or strands. Ideal for a necklace. 14k Gold Fun fact about the Babylock: 12 linked together make a bracelet for an average sized wrist. These are from my personal collection - purchased by me fro Marla Aaron website and pop up boutique at Bergdorf. I have 13 baby lock listed in different iterations and wore them connected a s a bracelet and on necklaces. Current retail is $775 plus tax~ I I zoomed in on photos so you do see scratches at 15x magnification but not when worn.