Abstract: An improved apparatus used in press brakes having a lower press member and an upper press member which are movable relative toward and away from each other for bending and forming sheet materials is provided. The apparatus includes a die base, first and second mobile carrier shoes, a plurality of spacer bars, and a pair of anvils. Each one of the pair of anvils is formed with four corners each having a separate and distinct radius of curvature so as to define four alternative forming surfaces. Each one of the anvils are selectively rotatable so that one of the four corners having the same radius of curvatures are on top and facing inwardly toward the other corresponding to first through fourth ones of the four alternative forming surfaces and forming first through fourth die-size openings therebetween used for bending and forming a material of different predetermined gauges.