The replacement extractor blade is compatible with NutriBullet Original 600W and 900W Pro Series models, including 600W units: NBR-0601, NBR-1201, NB-101, NB-101B, NB-101S; and 900W units: NB9-1301, NB-201. It does not fit Magic Bullet (MBR-1101, 250W), NutriBullet RX (1700W), NutriBullet Pro+ (1200W), NutriBullet Lean (1200W), Baby Bullet (200W), or Nutri Ninja. Made of food-grade stainless steel with a silicone rubber gasket pre-installed for leak-proof performance, the high-speed blade is durable, easy to clean, and uses cyclonic action to break down tough ingredients for smoothies, omelets, snacks, and nut butters. The blade assembly measures 4.1 inches (10.48 cm) in diameter and 1.59 inches (4.04 cm) in height. Before use, ensure the O-ring is snugly in place (it may loosen during transport) and check the black gear at the bottom—screw it counterclockwise if loose.