Please confirm that it is 5 fins and a diameter of 3.15 inches / 8.5 cm before purchasing. Please measure the number of base fins and the size of the original blade. Replaceable Model The 5 fins blender blade is suitable for blender models: QB3000, QB3000SSW-30, QB3000QR-30, QB3001SS-30, QB3000QBK, QB3004, QB3005. Not compatible 7-pin/fins, 6-pin/fins, if your blender model starts with Bl2, Bl4, Bl6, Bl7, BL8, BN, , NN, CT, QB, this blade is not compatible with your blender. Tips: 1. Do not overfill! To avoid overflow, do not add ingredients that exceed the "maximum" fill line. 2.Do not operate the blender for more than 4 minutes at a time to avoid overheating. 3.Warm reminder that your it is best to replace the blender blade every 6 months. (Specific according to your frequency of use) 4.Please check if the bottom gear is loose during use. If it is loose, please tighten it. 5.Make sure the rubber gasket is glued to the bottom blade to prevent leakage. Statement: The 5-blade blender