Clamp odd shapes and angles without having to make cauls and clamping blocks. Originally developed for the military, X-Treme Tape is made from an elastic, silicone compound which adheres to itself when wrapped under tension, and applies even pressure to the most irregular shapes. Rubbery material firmly grips wood, but won’t damage the finish because it only adheres to itself. It forms an air and water-tight seal, is heat-resistant up to 500° F, and insulates up to 400 volts per mil! Also great for plumbing fixes, electrical connections and marine applications. 10' roll.