[No More Crack and Leaks]For this version 7 fins blade compatible for blender, we updated the carbon steel bearing to 420 stainless steel high speed bearing, which greatly enhances the durability of our blender blade and eliminates rusting Please confirm first that your for Blender meets these three necessary conditions:1,Your for blender blade is 7 fin blade(not 6 fin);2,The bottom diameter of your blender blade is 3.9inch; 3,Your for blender cups is 18oz,24oz,or 32oz.Not 16oz. Extra Gasket: There is already one gasket in blade when you receive this for Blender Accessories, the extra gasket is for replace in ,do not install the extra one when test. Our 7 fins replacement blades apply to BL450-30, BL455-30, BL480D, BL481-30, BL482-30, BL486CO, BL487, BL487-30, BL487A, BL487A-30, BL487T, BL487T-30, BL488W, BL490, BL491, BL492, BL492W, BL492IS-30, BL640, BL640-30, BL641, BL641-30, BL642, BL642-30, BL642W1-30, BL680A, BL680A-30, BL682, BL682-30,BL682QRT-30, BL685-30, BL2012, BL2013, CT641-30, CT680SS, CT680CO2SS, CT680CO2SS-30, BL687CO-30, NN100, NN100A, NN100-30, NN101, NN101-30, NN102(Only fit for 18oz, 24oz, 32oz cups not fit for 16oz)Not fit for BL660, BL663, BL740, BL770, BL771, BL773CO, BL780, BL780, BL820, BL830, BL450, BL451-70, BL454-70, BL482-70, BL480, BL480D-30. Please confrim your for blender model number before order this blender lid replacement. Color: As Shown Material: Stainless Steel+Plastic Package Contents: 2 x Knife mount 2 x Rubber ring 1 x Cleaning brush Only the above package content, other products are not included. Note: Light reflection 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.