Package include: 2 plastic gears for the motor base and 2 rubber gears for under the blade. Blade is not included

Model number: Base gear replacement for Magic Bullet MB1001 (120V, Max 250W, 60HZ)

Size: 30mm diameter whole piece and approximately 4mm diameter internal screw hole

Good replacement: This is non-original aftermarket part,but It is made exactly fit for Magic Bullet

Easy to install: 1. Take a towel, with a towel wrap blade with his left hand holding. 2. Right hand holding the connecting shaft, connecting shaft rotate clockwise to fall. 3. When installing counter clockwise to tighten