Porcelynne Black Nylon Coated Metal Replacement Bra Strap Slide Hook - 3/4" (18mm) Opening - 10 Pairs (20 Pieces) Black Nylon Coated Metal hardware. Used on bra straps, tank top straps and headbands. Accommodates 3/4" wide elastic. Replacement hardware for straps. Matching hardware also available by Porcelynne