Chain Link Varia Master Link 1/2" x 1/8" 3-Piece

These are only for single-speed chains, but not all single-speed chains are 1/2" x 1/8".  Most 1-speed beach cruisers and small children's bikes that have a coaster brake in the rear hub are 1/2" x 1/8".  Be sure of what you have before ordering.