Selectorized Leg Extension (With Optional Range of Motion Selector) A100 The back pad adjusts to provide consistent alignment of the knee with the machine axis of rotation. The angle of the seat and lumbar support pad offer greater isolation of the quadricep muscles. The roller assembly is quick and easy to rotate for desired height and pre-stretch option. Variable cam provides proper muscle loading throughout the strength curve. Maintenance free pillow block bearings enhance the smoothness through the range of motion. Specifications: Size: 48"(W) x 42"(L) x 62"(H) Stack Weight: 230 lbs. (23x10lb) Shipping Weight: 425 lbs. Target Muscle Groups - Quadriceps Features: Kevlar Drive Belts for Longer Life and Smoother Performance Moulded Feet for Floor Protection Protective Wear Guards on Upholstery High Use Areas Solid One-piece Frame Construction comprised of 2x3" and 2x2" tubing Superior Grade Foam and Mildew-resistant Naugahyde