Material:nylon,Made of durable plastic with spring stop structure. Single hole cord locks: plastic single holel round cord lock is used to lock cord for convenient use. Size:22.6x 18 mm/ 0.89 x 0.7 inch,the hole diameter is approx. 5 mm Widely used:for lanyard, luggage, clothing, backpack, sportwear, shoelace, tent etc. Spring design, strong and durable to grip and tightening strings.