Easy Installation: Insert the end of your cord into the crimp end, and use your pliers to flatten the folds at a time, tightly to the cord. These will fit up to 3 mm cord Lobster Clasp Connection: Qulltk's crimp cord ends features a lobster claw clasp in the middle, making it easy to connect and detach, ensuring the stability and convenience of your jewelry designs Size and Quantity: about 4 mm wide, 31 mm long ; Package Included: 20 sets Lobster clasps with clip ends in shiny silver and golden color, fit for normal bracelet, necklace or choker making Material: 316 grade stainless steel which is smooth, surgical grade, hypoallergenic, and tarnish resistant metal Application: Suitable for the latest leather, organza, silk and satin cord necklaces. Compatible with leather, suede, tassel, lace, hemp, or rattail satin cord bracelet, necklace or choker making Lobster Clasp