0165-0220:Chrome-plated brass and bronze with soft black liner. Clamp-on feature eliminates drilling rail and simplifies relocation. Mounts on vertical or horizontal rails. Adjustable for rails 7/8" to 1" in diameter and by reducing mounting bolt length, 3/4" rails. 1-5/8" inside dimension, 2" outside dimension, 9" length, weight 2-1/4 lbs.0165-0011: Chrome-plated zinc with polished stainless steel tube hard black plastic liner. Clamp-on feature eliminates drilling rail and simplifies relocation. Mounts on vertical or horizontal rails. Adjustable for rails 7/8" to 1" in diameter and by reducing mounting bolt length, 3/4" diameter rails. 1-5/8" inside dimension, 2" outside dimension, 9" length, weight 2 pounds.check description