A print of the tube bend, if available. We can also work from an XYZ dataset of the bend coordinates.bullet Tube shape. For example, round, square, rectangular, elliptical, or oval, bullet Orientation of non-round tube bend, either hard-way (major axis in plane of bend) or easy-way (major axis perpendicular to the plane of bend).bullet Outside diameter or outside dimensions of tube. If your request is for pipe, please tell us if you are specifying the true outside diameter or using the nominal IPS or EMT diameter. Similarly, if your request is for copper tube, please tell us if you are specifying the true outside diameter or using the nominal K-type or L-type diameter.bullet Wall thickness. If you are bending laminated tubing, we can specify the mandrel more accurately if you provide us with the thickness of each lamination.bullet Bend radius. Please tell us if you are specifying the centerline radius (typical for round tubes) or the inside radius (typical of non-round tubes).bullet Degree of bend. Unless a special consideration is involved, we recommend that you specify this as either a 90-degree bend or a 180-degree bend to maximize the utility of your rotary-draw tool set for other applications.bullet Tubing material. For example, mild steel, stainless steel, titanium. If your request is for either aluminum or copper tubing, please give us the exact material specification or in the alternative whether the material is hard or soft. These two materials vary widely in hardness, and will change the tools we recommend if in the soft condition.bullet Make and model of your rotary-draw bending machine. We have the mounting specifications for most machines on file. If we don't have the information for your machine, we will send to you blank tool drawings so that you can fill in the basic dimensions for the mountings.bullet If you have not sent us a drawing and your request is for a multiple-bend tubular component, please inform us any mid-tangent restrictions on clamp length. Similarly, advise us if the request is for "bent-leg" U, a serpentine bend, or other multi-bend configuration that will cause clearance problems with your machine.bullet Finally, please tell us if serrations (which improve the grip of short clamps, but the trade-off is marking of the outside surface of the tube) are acceptable or unacceptable.