Porcelynne Black Nylon Coated Metal Replacement Bra Strap Slide - 1/4" (7mm) Opening - 10 Pairs (20 Pieces) Black Nylon Coated Metal hardware. Used on bra straps, tank top straps and headbands. Accommodates 1/4" wide elastic. Opening is 1/4" by 1/8". Replacement hardware for straps. Matching hardware also available by Porcelynne