*KeyFeatures *Binding Efficiency and Neatness: Our binding machine handles bulk projects effortlessly, punching up to 21 holes, 12 sheets, and binding 450 sheets at once. Ideal for schools, offices, and businesses, it ensures professionally finished documents. *Compatible with Various Sizes: This comb binding machine is suitable for Letter size, A4 size, A5 size, and more, ensuring strong compatibility for various document bindings. *Easy to Operate: Designed for user convenience, our comb punch binder features adjustable edge guides and side margins, and expandable comb binding from 3/8'' to 2''. Simply press the handle lever upward to punch and downward to bind, making operation easy and effortless! *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. *Abundant Accessories, Great Value: Our comb binder machine comes with 100 pcs of 3/8'' comb binding spines, and 1 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. ******************************************************************************************************* *Specifications Item Model Number: STB12A Primary Materials: Iron Base (Powder Coated) + ABS Plastic Shell + Metal Side Arms Product Weight: 7.7 lbs/3.5 kg Product Size: 15.2x10.8x13.6 inch/385x274x345 mm ******************************************************************************************************* *Pakcage Content 1 x Binding Machine 100 x 3/8'' PVC Comb Strips 1 x Oil Absorbent Paper 1 x Instruction Manual