100pcs Coil Crimp Ends in Silver Tone, Spring Fastener, Cord End Caps. Fit for 4mm Cords and Under. Jewelry Findings #SD-S7012 Quantity: 100pcs Material: Metal (Iron) Dimensions: 5mm (w) x 7mm (h) (Approx) Tube Hole Size: 4.2mm (Approx) Color: Silver Tone