21x14x12mm cast bails. Designed for 50mm #6919 Swarovski crystal key pendants. JBB Findings is internationally known as a manufacturer of quality jewelry findings & supplies. Silver plate is a thin surface layer of actual silver. Fits up to 4.6mm cord and chain. Insert bail, loop first, through the front of the hole in key pendant, then turn it 90°. Once strung on cording, the bail will securely hold the crystal.