[Note! ] 6 fin bottom blade is only applicable to cooking machine models: BL660, BL663, BL663CO, BL740, BL770, BL770W, BL771, BL771C, BL772, BL772Q, BL773CO, BL773CCO, BL780. , BL780 C.[16 ounce cup] This blade is only suitable for 16 ounce cups. ( to 18 ounces (approximately 510.3 grams), 24 ounces (approximately 680.4 grams), and 32 ounces (approximately 907.2 grams).[High Quality] The high-speed blade is made of food-grade high quality material, and its high hardness brings qualified anti-corrosion performance. In addition, the exterior is made of durable material, which is not easy to break and scratch.[Important Note] A washer is already installed when you receive the blade, please make sure it is close to the bottom blade before use; 2. If you want to replace the gasket, please remove the pre-installed gasket of the bottom blade; if the bottom blade leaks, Maybe it's because you didn't close the blade to the cup tightly enough, or the gasket was loose.colour:BlackMaterial:Stainless steel + plasticPackage Contents:2 x 6-page knife holder2 x sealing ring1 x cleaning brushOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +\/- 1-3cm.