Severne aluminum extensions set the standard for durability and performance - they start with custom 32 millimeter, 6061 T-8 “drawn” aluminum tubing. The kind of tubing they use to make aircraft. With an incredible strength to weight ration, these are the extensions you want when gear failure isn't an option. The holes are precision punched, then the tube is red anodized in and out, permanent laser numbered 2 centimeter settings. The adjustment settings are held with a hard anodized aluminum collar tethered with a spectra line to a stainless steel pin. And the beefy “Power-Six” super powerful 6:1 downhaul cleat with large diameter pulleys are oriented perpendicular for power, easy rigging and no crossed lines. An 12-plait Dyneema downhaul line is included.