21x14x12mm cast bails. Designed for 50mm #6919 Swarovski crystal key pendants. JBB Findings is a major manufacturer of high quality jewelry findings & supplies. Copper plated components tend to be more durable than solid copper parts. 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.