This 10mm Male to 14mm Male Adapter is made to fit either a 14mm Female Bong or Rig or a 10mm Female Bong or Rig and a 14mm Female Banger or a 10mm Female Banger. Adapters change either the gender or size of your glass accessories, if you find yourself with a banger or bowl that does not fit your favorite glass rig you can surely purchase an adapter to get it to fit!