Slide Ring 180 Degree Inside Dia 722.26 mm Outside Dia 875.74 mm Number of Rail Holes 8 Mounting Hole Center to Center 799 mm Mounting Hole Size 14 mm Thread Size M12 Screw Type Socket Head Cap Screw Temp Range -20 to 60 Rail Material Steel Rail Finish Precision Ground For Use With FCP76799 Carriage Plate