1/4 Inch Slit Red Wire Loom. 1/4 inch inside diameter red colored polyethylene slit wire loom is corrugated and highly flexible. Slit down the entire length for easy wire insertion. Protects small runs of wires from abrasion and provides a clean look. When using cable clamps to secure the loom, use a clamp that is 1/8" larger than the loom used.