This black bakelite plastic screw on bottom cap is what holds the blade on the bottom of the jar. Fits ALL Oster blenders， Osterizers and Oster Kitchen Centers. Also fits some Sunbeam models which use a metal drive pin.<br><br><b>■返品について</b><br><b>返品不可（商品に不備・欠陥がある場合を除く）。</b><br><br>その他、ショップ情報欄をご確認ください。