Slide Ring Full Ring Inside Dia 956.26 mm Outside Dia 1109.74 mm Number of Rail Holes 20 Mounting Hole Center to Center 1033 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 FCP761033 Carriage Plate