Pop-Lok® Cord Lock  
Description:
·30% stronger lock than other competetive versionsis. ·Larger opening to accommodate larger cords.
Material: Acetal(POM)
Size:     
two 1/8'' (3mm)  2-16523  
two 3/16" (5mm)  (fit these 3 sizes)  
one 1/4" (6mm)