First aid box for 50 people is a comprehensive kit, often in a durable plastic case with compartments, containing supplies to treat minor injuries for up to 50 individuals, meeting standards like OSHA/ANSI; it typically includes various plasters, sterile dressings, triangular bandages, antiseptic wipes, safety pins, gloves, scissors, and first aid guidance, designed for workplaces or groups to manage common injuries like cuts, sprains, and abrasions.