1. Each elbow bender bends one size only. 2. You can bend hoses, brass type, aluminum type, kind of soft iron pipes, stainless steel pipes and some very thin tube. 3. The red mark shows the standard scale, wide hook can be firmly grasp the pipeline safety. 4. You can bend a small radius smooth, thin 0.5mm tube to 180 degrees and require only minimal force, no bruised prints, scratches and deformation. 5. With a fixed hook, beginning from 90 degree bend quickly, effort and precise bent out of standard pipe. 6. metric and imperial products to choose from.