Practical Accessories: Our punch binder comes with a pcs of oil-absorbing paper. No need for separate purchases! Use the oil-absorbing paper to clean the machine before the first use to avoid paper soiling, as it is lubricated. Sturdy & Durable Material: Crafted with a cast iron base with a powder-coated surface, our book binder is robust and rust-resistant. The ABS plastic shell is wear-resistant and not easily cracked. Metal side arms and carbon steel blades ensure durability and precise punching. Easy to Operate: Designed for user convenience, our coil binding machine features adjustable edge guides and side margins, and adjustable binding spine sizes from 3/16" to 9/16" (binding spines need to be purchased separately). Simple operatiom with a handle lever press. Compatible with Various Sizes: This coil spiral binding machine is suitable for Letter size, A4 size, A5 size, and more, ensuring strong compatibility for various document bindings. Binding Efficiency and Neatness: Our binding machine handles bulk projects effortlessly, punching up to 34 holes, 12 sheets, and binding 120 sheets at once. Ideal for schools, offices, and businesses, it ensures professionally finished documents.