Perfect Fit: This replacement lid has a 4.5” outer diameter and a 4” Inner diameter. Compatible with Oster and Osterizer Blender 5 cup jars with square tops. Plug & Play Replacement: Simply replace your won or lost original lid with this direct drop-in replacement - no tools required for installation. Sturdy Construction: Made of durable and flexible rubber, it will ensure a watertight seal and a secure fit that will not fall off. It features a clear center plastic cap. Easy to Clean: The flat and ergonomic shape makes it an ease to wash and clean, and fits nicely in your dishwasher! Esta tapa de repuesto tiene un diámetro exterior de 4.5" y un diámetro interior de 4". Compatible con Oster y Osterizer Blender Tarros de 5 tazas con tapas cuadradas. Blender Square Lid - Black Compatible with Oster and Osterizer Blenders 5 cup jars with a square top Black lid and center cap. Fit all Oster blenders and Kitchen Centers using a 5 cup square top jar