Here are some black plastic cord lock stoppers #CL1

They are sold in lots of 2, 6 and 10 

They are barrel toggle style, single hole for 5 mm =3/16 cord string and they are
spring loaded.

They measure 15/16 = 24 mm long almost 1 inch and 3/8 = 10 mm wide  

They are used with Drawstring  Paracord , Lanyards, Luggage, Clothing, Hand bags, Backpacks, Purses.  

Check out other colors and styles - see store under toggle buttons or drawstring cord end stop caps.