Discs weighing 5kg and under must not exceed how many centimeters in thickness?

The correct answer is based on the standards set by the International Powerlifting Federation (IPF) regarding equipment specifications, specifically concerning the dimensions of weight discs. Discs weighing 5kg or less must not exceed 3 centimeters in thickness to ensure uniformity and safety in competition. If all discs adhere to this thickness, it helps maintain consistency in how they stack and fit on barbells, preventing uneven loading that could affect performance or lead to safety issues.

This standard is critical for ensuring fair competition and maintaining the integrity of the sport, as discrepancies in equipment can lead to advantages or disadvantages for competitors. The guideline helps referees to enforce consistent equipment rules, which is essential for maintaining a level playing field.