50 – Guardhouse 2×2 Tetra Plastic Snaplocks Coin Holders for Large Dollar Coins. Fits Large Dollar 38.1mm Coin. Guardhouse Tetra coin holders are a great storage solution for your individual coins. Our plastic 2×2 snap lock 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 2×2 coin holders are made from sturdy acrylic plastic and fit perfectly in Guardhouse Tetra display boxes and white Tetra storage boxes. Guardhouse Tetra 2×2 snaplocks are packed 25 per pack.