RBV type RBV type（Changeable adjustable type） Adjustable thread rolling dies Boss Pattern thread tolerance adjustable (6g, 6e, 6h) heavy duty for highest pitch and profile accuracy Nitrided thread rolls with lead profile these thread rolling dies are mounted in normal die stocks like DIN EN 22568 There is no tool holder for RB/RBV type. Please prepare it as each dimension of rolling dies.