VB.839 three-arm knobs are characterized by an ergonomic design that provides a safe and comfortable grip by allowing the operator to apply a more direct transmission of tightening torque. This new design represents two overlapping triangles shifted to an angle of 8°. Smooth surfaces and lack of cavities ensure easy cleaning. VB.839 is made from technopolymer with center caps in the ELECOLORS chromatic range for perfect aesthetic compatibility between knob and machine.