●Made of tough metal; nickel plated ●Set of 50 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