(Note) I think a chain of about 3.5mm will fit through the plate. Total length: approximately 11.3mm. Inner diameter of the rounded bail: approximately 3.8x1.7mm. This is a pendant frame for a 6mm round stone with a 6-prong claw setting. Because it's a pressed frame, no advanced skills are needed for claw setting. If you're into crafts, you should be able to set the stone easily. For 6mm round stones, those with less thickness are easier to set. Some stones may not be able to be set depending on the stone. Please contact us if you would like multiple items.