Compatible with our 2" × 3" power racks and Smith machines , these Spotter Arms are durable and adjustable attachments that feature foldable support, allowing for safe and stable lifts during workouts. Prevent accidents from occurring during heavy lifts by adding these incredible accessories to our top-of-the-line B52, F22, and F35 models. Note: Exclusive for Major Fitness – Incompatible with other brands' Smith Machines & Power Racks!