Reduced wall flexible aluminum conduit. Maintains all the strength and durability of steel, but is 2/3 lighter in weight. Designed to meet industry specifications for use with standard conduit connectors and device boxes. Meets UL Standard 1, NEC Article 350, and Federal Specification WW-C 566C. No. 5601-30-00: 3/8" x 100, internal diameter: 0.375 minimum, 0.393 maximum; external diameter: 0.560 minimum, 0.610 maximum; 2" bending radius No. 5602-22-00: 1/2" x 25, internal diameter: 0.625 minimum, 0.645 maximum; external diameter: 0.860 minimum, 0.920 maximum; 3" bending radius No. 5602-24-00: 1/2" x 50, internal diameter: 0.625 minimum, 0.645 maximum; external diameter: 0.860 minimum, 0.920 maximum; 3" bending radius No. 5602-30-00: 1/2" x 100, internal diameter: 0.625 minimum, 0.645 maximum; external diameter: 0.860 minimum, 0.920 maximum; 3" bending radius No. 5603-22-00: 3/4" x 25, internal diameter: 0.812 minimum, 0.835 maximum; external diameter: 1.045 minimum, 1.105 maximum; 4" bending radius No. 5603-24-00: 3/4" x 50, internal diameter: 0.812 minimum, 0.835 maximum; external diameter: 1.045 minimum, 1.105 maximum; 4" bending radius No. 5603-30-00: 3/4" x 100, internal diameter: 0.812 minimum, 0.835 maximum; external diameter: 1.045 minimum, 1.105 maximum; 4" bending radius