Base gear replacement is designed to fit the Magic Bullet Power Base and it is used for both Cross and Flat Blade models Fits Magic Bullet Juicer Blender models: MB1001, MB-1001, MBR-2501, MBR2501, MB1001C, MB-1001C, 1001C, MB1001B, MB-1001B, 1001B, 1001, 7712, 101, 2501 Also suitable fix for Party Bullet, Baby Bullet and Merlin 123 models; NOT COMPATIBLE with Nutri Ninja or NutriBullet blenders. Packaged includes 2 (two) base gears for Magic Bullet blenders 2 Pack Base Gear Replacement Part Compatible with Magic Bullet 250W Blenders MB1001. Did the Base Gear on your Magic Bullet Power Base break? LOOK NO FURTHER. We have the replacement! Package includes 2 (two) motor base gear replacements. Dimensions: 1.3 inches (diameter) x 0.4 inches (height). Compatible with Magic Bullet MB1001 Blenders ONLY. Directions: To remove your broken piece, use a flat screwdriver at bottom center of power base and turn gear on top clockwise with vise grip and protective cloth. You have to put a lot of strength on it. It's gonna be a bit tough to turn. NOT COMPATIBLE with Nutri Ninja, NutriBullet or Baby Bullet blenders.