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A stainless steel tube cutter is a handheld device that clamps around a tube of stainless steel and cuts it with a small rotating wheel. Make sure you get a tube cutter designed specifically for stainless steel. Some stainless steel tube cutters can cut through thicker tubes than others, so know the measurement of your tube before you buy one. Line up the section you want to cut with the wheel on the cutter. Once your tube is in position, tighten it into place by rotating the knob at the end of the device. Keep rotating the knob until the tube is secure. Hold the exposed end of the tube in one hand and rotate the tube cutter with your other hand. As you rotate the tube cutter around the tube, the small wheel on the cutter will gradually cut through the tube. Eventually, the wheel will cut all the way through the tube and the piece of tube you cut will fall off. Rotate the knob at the end of the tube cutter if the tube is stuck. Be careful handling the cut edges of the tube. If the edges are sharp, file them down with a deburring tool.
Buy a stainless steel tube cutter. Insert your stainless steel tube into the tube cutter. Rotate the tube cutter around the tube until it cuts through it. Remove the tube from the tube cutter.