NICKEL Direct-Fit Airtight 21mm Coin Capsule Holders For NICKELS (QTY 25) Lot of 25 DIRECT FIT AIRTIGHT COIN CAPSULES Holds U.S. Nickel. Holds coin having 21 millimeters diameter. Manufactured (injection molded) using acrylic plastic with a non-yellowing agent, producing a two piece, snap together, friction fit cover and base. Highly durable and scratch resistant. Brand new condition. Coins not included. Box is included.