Get versatility with West Coast Paracords heavy duty barrel cord locks. Use with anything from lanyards, backpacks, shoe laces, sleeping bags, pants, shoe laces, jackets, drawstrings, or DIY projects. Use in a survival or bug out bag as an emergency tool. They can fit in a variety of different cords and fabrics that measure up to 1/4 Inches or use two pieces of 4mm / 0.157-inch cord.  Compressing the closure to thread the cord is easy to do. Once the cord has been threaded through the pre-aligned holes the stainless-steel spring mechanism will grip and hold any cord tightly. Provides durability so you won't have to worry when you are outdoors in -50-150-degree F weather or climates. Will withstand conditions such as salt water, mud, or dirt. Easy to use, they allow for one hand adjustment making our toggle stoppers so user friendly. The possibilities are endless with these cord locks, they truly are a tool you didn't know you needed. To preserve the spring for on-demand cord lock use, some ellipse cord locks may come un-activated. To activate these cord locks PUSH DOWN HARD ON TOP OF THE LOCK TO MAKE THE SPRING POP - you will hear a clicking noise when locks are activated.