GBC DocuBind Punching & Binding System Plus Heavy Duty 3-Hole Punch 3 hole punch - easily punches up to 25 sheets at one time. Ideal for preparing paper for ring binders. GBC - 19-hole punch - adjustable for perfect punching of papers and oversized covers Plastic binding - binds with elements up to 5/8" (112 sheets) for the GBC finishing touch