D924 Portable Plastic Register for 4 x 6″ Forms Durable portable registers give you a ready writing surface with space to store file copies. Holds up to 75 2-or 3-part forms, 50 4-part forms. For 4 x 6″ forms. Use pen to advance forms. Overall size 4 3/4 x 8 1/4 x 1 7/8″. Silver-Gray Cycolac Plastic Copies stored on back.