Black Diamond Tubular Ice Screws are made for the climber who values life and isn't willing to mess with sub-par designs when the chips are down. In desperate situations seconds count. And when it's one screw between you and the deck, quality counts. That's why Black Diamond Tubular Ice Screws are made from 4130 aircraft-quality seamless steel tubes, pierced and cold-drawn for superior strength. The teeth are cut on a vertical mill then heat treated and plated with bright nickel. With aggressive threads for holding power and tapered tubes for ease of placement, this is a screw that cuts sharp, pitch after pitch, year after year.