ITEM NAME:Oster Blender Bottom Jar Base Cap Replacement fit for Oster Blender Osterizer Hf Black Replacement Jar Bottom Base Cap Nut Appliance Parts Fit For Oster Blender SPECIFICATIONS.(Compatible With: fit for multiple different Oster models. 1) The purpose of this item is to hold the blade and seal in place at the bottom of the blender jar. Item included: 1 x Bottom Base. 3) Over tightening may crack this part, dropping it may break it and excessive heat may warp it.