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OD - refers to actual Outside Diameter of the tube as measured with a caliper.
CLR - stands for Center Line Radius, meaning the bend radius as measured from the center rotation point of the die to the middle of the tubing.
Max Degree of Bend - Dies can bend up to the specified angle depending on material springback. Dies marked Full can bend up to 180 degrees but will need to be relieved to remove from die.
Wrinkle Dies - Wrinkle dies provide a consistent controlled wrinkle on the inner radius of the tube.
Radius Dies require two back shoes to perform a bend. (See accessories tab)