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