Model100′ x 3/8 Sewer Machine. Cutting TypesArrow/Spade/C/Boring Bulb Cutter. It is our foundation. 100 Feet Steel Core Unclog Tube? The 100ft (30.5m) length of unclog tube is made of high-quality steel mn65 hot-pressed, which is non-rusting and more tough, and can easily pass through multiple curved pipes to clear blockages.