The Fit Up Pro Internal Alignment Clamp has two independent expanding clamps, allowing independent alignment of two hollow cylindrical components of different diameters. The bottom expanding clamp is inserted and clamped in the pipe by means of the knob. Then the other part (e.g. a flange) is placed over the top expanding clamp and clamped by means of the hand-bar. This model is especially suited for heavy parts. All locating rails are in Stainless Steel.