Porcelynne Silver Metal Alloy Replacement Bra Strap Slide - 1/2" (13mm) Opening - 10 Pairs (20 Pieces) Silver metal alloy hardware. Used on bra straps, tank top straps and headbands. Accommodates 1/2" wide elastic. Opening is 1/2" by 1/8". Replacement hardware for straps. Matching hardware also available by Porcelynne