Model NO.: SAE 100 R2 Diameter: Inner Diameter From 4.6 to 63.1mm Standards: SAE 100 R2 Inner Diameters: 3/16, 1/4, 5/16, 3/8, 1/2, 5/8, 3/4etc. Materials: Rubbers and Plastics Enforcing Layer: Steel Wire Braided