OD: Refers to the actual Outside Diameter of the tube as measured with a caliper.ĬLR: stands for Center Line Radius, meaning the bend radius as measured from the apex of the bend to the middle of the tubing. Pay close attention to the following terms (for more information on these terms, see our 'Tube and Pipe Bending Basics' page, located under the Resources tab): Our 'What am I bending?' page (see our Resources tab) is a useful tool if you're not sure what the difference between tube and pipe is. These dies fits the 105 Standard Duty and Heavy Duty Tube and Pipe Benders for bending round tubing with a maximum degree of bend of 180 degrees after springback.