■ Consists of three lead plates for testing the alignment of the converging filter grids of radiographic equipment with the center of the useful beam;

■ Consisting of a filter grid alignment test plate with dimensions 230 mm x 90 mm x 3 mm (hole diameter 10 mm, hole spacing 25 mm) and two small lead plates (dimensions: 90 mm x 60 mm x 3 mm) capable of covering the area of four large circular holes at the same time.