POLARIS 3591 Replacement Punch Set (Φ0.04 - 0.31 inches (1.0 - 8.0 mm) 14 Sizes): For drilling holes in various leather, fabric, cardboard, documents, etc. 14 size holes with diameter 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, 6.0mm, 6.5mm, 7.0mm, 8.0mm Designed to hold the scum inside so it wont get mess. When using it, place it vertically above a certain hard-eyed wood or hard plastic, and tap the head with a hammer