APPLY TO - cord lock stoppers can be widely used for drawstrings, rounds, shoelaces, clothes, bags, and backpacks. SPECIFICATION:Material: Plastic, MetalColor: Black;Cord Hole Size: 6.6 x 5mm/0.26" x 0.2"(L*W);Total Size: 21 x 11 x 7mm/0.83" x 0.43" x 0.28"(L*W*H) 27 x 14 x 10mm/1.06" x 0.55" x 0.39"(L*W*H)QUANTITY INCLUDED - 6pcs x Cord LocksADVANTAGE - The cord locks are made of plastic. No odor and not easily break, durable and lightweight, you can reuse these cord stoppers for a long time. 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 hole choose the proper cord lock.