These crimpable end caps have 4x2mm holes large enough to accommodate large stringing materials like round cords, suede lace, and ribbons. To hold materials in place use a hammer and block, tapping gently until hold is achieved, or try nylon jawed flat nose or parallel pliers! (Glue also works.) Pair them with our Distressed Barrel Beads. The lightly hammered texture works nicely with our Hammertone products.