ABBECIAO 1/4″×2″ Aluminum 3D Rectangle Stamping Blanks. ABBECIAO 3D Rectangle Bar Stamping Blanks. Stampable on All 4 Sides. ABBECIAO Light Weight Aluminum 3D Rectangle Stamping Blanks Engraving Bar, available in two sizes: 1 1/2″ x 1/4″ and 2″ x 1/4″.