The Tapepro Flat Boxes are high capacity, and feature a unique peened construction for additional strength. Tapepro Flat Boxes apply joint compound to all flat recess and butt joints, automatically crowning the joint and feathering the edges. The pressure plate is fitted to an axle for the smoothest operation. The wheels are mounted on a fixed axle for more rigidity and run inside the blade width so the blade is always the last thing on the wall – very handy for butt joints!