High quality metal passing rings have a plastic inner lining making them smooth and quiet when pulled on a metal curtain pole. Pack size 8, trade packed, loose. To fit a 28mm diameter Bay pole that uses the passing bracket and ring system only Available in 4 colours Internal ring diameter 40mm, External ring diameter 62mm All sizes are approximate Curtain pole lengths that can be used with these rings are available in our eBay store on item number 171391704763