Here are some black plastic cord lock stoppers #CL9
They are sold in lots of 2, 6 and 10
They are barrel toggle style, single hole for up to 10 mm =3/8 cord string and they are spring loaded.
They measure 1 1/16 = 27 mm long almost 9/16 = 14 mm wide and 3/8 = 9mm deep
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.