Rubber Block. Squadron Tools. 4-inch x 4-inch x 1-inch vulcanized tough rubber block. Comes in handy when filing, using a punch-and-die set, cutting photoetch parts or hammering small brass sheets into form. Enables the modeler or user to remove dents or straighten metal without the risk of distorting or scratching. Surface is antislip and will help holding parts in place while filing. Can be used as a weight for glued pieces while drying. Absorbs shock when hammering.