Univen BL5000-11 Blender Jar Bottom Screw Cap fits Black and Decker Models Fits Black & Decker Blender Models BL1900, BL2900, BL3900, BL4900, Fits Black & Decker Blender Models BL5000, BL5900, BL6000, BL9000 Top of cap has 2.75" opening where it screws on to jar. Only fits Models Shown. Please check pictures and measurements BEFORE ordering. Please verify your cap looks the same and has same measurements