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 using a hammer and block, tapping gently until the hold is achieved, or try nylon jawed flat nose or parallel pliers! (Glue also works.) Distressed crimp ends caps, rhodium-plated, cord ends, crimps. Measuring 10 x 7mm. These are the fancy crimps that B'sue used in her Easy Leather Cord Necklace Youtube video. Sold by the pair.