A very high-quality MILSPEC polymer cord lock, these same ones are used on Finnish army M05 vests, pouches, and backpacks. Incredibly strong and reliable.

Dimensions approx. 30 x 15 x 5 mm (1.2" x 0.6" x 0.2"), cord hole diameter 6 mm (15/64"). Made from PA6, extremely resistant to shocks and freezing temperatures. The stainless steel springs are strong, the lock offers over 30 lbs of resistance without bottoming out!