APPLY TO - Widely used for cords of lanyard, clothing, backpack, shoelaces, drawstrings, luggage, bag, and a variety of outdoor and gym accessories.SPECIFICATIONMaterial: PlasticTotal Size: 11.5 x 13mm/0.45" x 0.51"(D*L)Cord Hole Large Diameter:8.5mm/0.33"Cord Hole Small Diameter:4.5mm/0.18"QUANTITY INCLUDED - 12pcs Bell End StopperADVANTAGE - Drawstring rope stoppers are made of plastic, sturdy and durable, lightweight and resistant to wear, which can be used for a long time.INSTALL: Just stick it through, tie a single knot, and pull hard. It will give you a firm grip, help prevent drawstrings from slipping.Note: Please according to the thickness and width of your needs to choose the proper cord lock