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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.
Wrinkle Dies - are made to form a controlled wrinkle on the inner radius of the bend which allows for use of thinner wall tubing or 304 stainless tubing which would normally fail to bend smoothly.