Porcelynne Black Nylon Coated Metal Replacement Bra Strap Slide Hook - 1/2" (13mm) Opening - 10 Pairs (20 Pieces) Black Nylon Coated Metal hardware. Used on bra straps, tank top straps and headbands. Accommodates 1/2" wide elastic. Replacement hardware for straps. Matching hardware also available by Porcelynne