APPLY TO - Round cord locks are suitable for shoelaces, backpacks, lanyards, luggage, pack drawstrings, tents, and many more uses!SPECIFICATION:Material: Plastic, Metal;Size: 1.9 x 1.5 x 1.2cm/0.7" x 0.6" x 0.5"(L*W*H);Hole Size: 7 x 4mm/0.3" x 0.2"(L*W);QUANTITY INCLUDED - 20pcs 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.