50 ft. Soft Coil Copper Tubing, 5/16 in Outside Dia., 0.249 in Inside Dia./ CROSS-SECTIONAL SHAPE STYLE: 1 PLAIN ROUND WALL THICKNESS: 0.032 INCHES NOMINAL FIRST END INSIDE DIAMETER: 0.249 INCHES NOMINAL FIRST END OUTSIDE DIAMETER: 0.313 INCHES NOMINAL SECOND END INSIDE DIAMETER: 0.249 INCHES NOMINAL SECOND END OUTSIDE DIAMETER: 0.313 INCHES NOMINAL MAXIMUM OPERATING TEMP: 400.0 DEG FAHRENHEIT MAXIMUM OPERATING PRESSURE: 1197.0 POUNDS PER SQUARE INCH MEASURING METHOD AND LENGTH: 600.0 INCHES NOMINAL LAYING MATERIAL: COPPER