Very good product for office and school use. Also its usage is where you need to bind maximum sheets at a time. It consist of strengthened plastic body with metalic internals.Opal stapler dual HD 30-N is a heavy duty stapler with plastic and metallic built. It uses staple pin off size 24/6,26/6 and number #10 staple pin. Adjustable platform with good plastic built. It has capacity of binding heavy number of sheets one time.