APPLY TO - Round cord locks are suitable for shoelaces, backpacks, lanyards, luggage, pack drawstrings, tents, and many more uses!SPECIFICATION:Material: Plastic, Metal;Color: BlackSize: 1.8 x 1.9cm/0.7" x 0.7"(D*H);Hole Dia: 5mm/0.2";Net Weight: 20gQUANTITY INCLUDED - 10pcs x Plastic Cord LockADVANTAGE - Spring cord lock is made of plastic material, lightweight, durable, anti-rust, spring design, not easy to break, easy to install.INSTALL: Once the cord is easily threaded through the holes, a simple squeeze permanently the alignment mechanism and engages the metal spring to grip any cord.Note: Please according to the length and width of your needs choose the proper cord lock.