Amazon.com: 10mm Small Key Ring, 200 Pieces Mini Key Chain Ring Metal Small Split Key Rings for Keys Organization, Connecting Jewelry DIY Craft - Silver and Golden
Lucky Line Split Key Rings
Amazon.com : 2 Inch Flat Key Rings - Large Split Key Rings - Silver Steel Round Edged Circular Keychain Ring Clips - Sturdy Key Chain Ring Connector (Pack of 10) : Arts, Crafts & Sewing
Hillman 2-Pack Spring Tempered Steel Split Key Ring at Lowes.com