Binding Machine, Comb Binding Machine 21-Holes Binding 450 Sheets, Book Binder Machine with 100 PCS 3/8'' Comb Binding Spines, for Letter Size, A4, A5Binding Machine, Comb Binding Machine 21 Holes Binding 450 Sheets, Book Binder Machine with 100 PCS 3 8'' Comb Binding Spines, for Letter Size, A4, A5 Product Features 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