Fits Small Dollars. Guardhouse Tetra coin holders are a great storage solution for your individual coins. Our plastic 2x2 snaplock cases contain a black EVA foam interior to hold your coin in place and provide a great background to let your coin shine against. Guardhouse 2x2 coin holders are made from sturdy acrylic plastic and fit perfectly in Guardhouse Tetra display boxes and white Tetra storage boxes. Guardhouse Tetra 2x2 snaplocks are packed 25 per pack.