Aspire 100 Pack 25mm Key Ring with Extend Chain and 12mm Screw Eye, Charm Making Made of tough metal; nickel plated Set of 100 split key rings with attached extend chains & screw eye pins Split ring size: Approx. 1 inch (25mm); Chain Length: 3/4 inch (20mm); Screw eye size: Approx. 1/2 inch (12mm). Screw eyes pins are used for attaching beads, clay, resin to create your unique charms. Great key chain parts for DIY jewelry / craft making