BBostitch P51-5B 12 in. Crown 58 in. Pneumatic Carton Closer Stapler ReviewbP PP Bostitch P51-5B 12 in. Crown 58 in. Pneumatic Carton Closer Stapler PPowerful shuttle blade provides pre-compression prior and during the stapling operation giving a strong, tight closure without breaking the corrugated surfaceP6 in. x 1 in. throat area allows flexibility of staple placement and limits interference from obstacles such as box flangesPPenetrates and securely fastens up to two layers of AB-flute or four layers of C-flute boardsPC-curved blade available for sealing partial overlap cartonsPCompatible with SB 5019 12 in.