Bostitch P51-10B Pneumatic Stapling Pliers: Powerful shuttle blade provides pre-compression prior and during the stapling operation giving a strong, tight closure without breaking the corrugated surface. The 6-Inch by 1-Inch high throat allows flexibility of staple placement and limits interference from obstacles such as box flanges. C-Curved blade available for sealing partial overlap cartons. Penetrates and securely fastens up to 2x AB flute or 4x C flute boards.