Headshell alignment block used for and Azimuth alignment (vertical tracking alignment). You can set the angle of the cantilever relative to the record surface to closely approximate that of the original cutter head. This angle, referred to as the vertical tracking angle or , is changed by modifying the height of the tonearm relative to its base. Features - Color: Yellow. - Size: 6.60X4.80X0.80cm/2.59X1.89X0.31 inch. - Material: Acrylic. - With this and Azimuth Ruler, you can easily adjust the azimuth such that the body is parallel to the record surface. - Once a rough azimuth adjustment is found visually, it can be fine-tuned via measurement. - We can adjust arm height in an effort to the cutter’s path through the vinyl disc. - Easy install, no modifications needed. Replace old or broken with a new one. - Made of material, it is durable and wear resistant for long-term use. Package list: 2 x Azimuth Ruler