The Launch Disk.

The Launch Disk.
Launch Disk or Disk Release:
The disc consists of a wooden body with metal plates nailed to the sides and will, in the exact center of the circle framed
by metal rim, a device designed to ensure your correct weight, which is the measurement box.

The discs for the male category should be 2kg (min) and Diameter extracted from the metal rim of 219mm (min) to 221mm (maximum).
The discs for the female category should be 1Kg (min) and diameter of the extracted metal rim of 180mm (min) to 182mm (maximum).

The disc must be thrown from a circle of concrete with a ring of iron or steel with 2.50 m internal diameter. This circle
is protected by a C-shaped cage with an opening 7m and 5m and a height of 4m (preferred). Should the disk
fall within the lines that mark a sector of 45 °.

Source: Athletics