Vaultz Vaultz Locking Index Card File with Flip Top Holds 450 4 x 6 Cards, BlackHeavy-duty file safely holds index cards. Ideal for important photos, documents and supplies, too. Sturdy key lock keeps contents secure. Aluminum trim reinforcements plus chrome steel corners provide additional security. Soft felt interior. Card Holder Type: Card File Box With Hinged Lid; Card Capacity: 450; For Card Size: 4" x 6"; Color(s): Black.