In this model, we have provided very digital angle selection display with three presets. Now no need to have pin hole setting for different angles, just incrase the dial in C/w direction to increse the angle up to 180 degree and to decrese the agnle by rotating dial CCW direction. The use of three preset knobs is to set three different angles and just rotate the dial to that set knob to achieve perticular angles for example 45, 90 & 135 degrees.