Huth Bender Metric and NPS Pipe Dies

Material Size - refers to the Metric OD and Nominal Pipe Size (Outside Diameter of the tube in inches as measured with a caliper is noted in parenthesis)
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. (see image)
Max Degree of Bend - Dies can bend up to the specified degree of bend.