CYLINDER- DOUBLE WALL Bore sizes: 1-1/2in, 2in, 2-1/2in, 3-1/4in, 4in Six NFPA rod end options Aluminum alloy self aligning head Hard chrome plated rod Double-Wall - Double Acting Cylinder Standard Single End Rod [DW] Cushion - Both Ends [C] Bore - 2i [31] Stroke: 17