Aside from its unique tapered external contour this leveler has many exceptional features. The upper portion is designed to clamp around a tubular frame and can be adjusted around the frame before locking the upper portion in place on the frame. Then the frame can be leveled by screwing the mount to the desired height. The upper portion retracts into the mount to hide the threaded stem. This mount can be used on carpeting or on hard surfaces with special non-slip pads.