Columbia 5.5" Flat Finisher Box


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*Within the continental USA


Columbia's 5.5” specialty drywall flat box is specifically designed to apply joint compound to no-coat 325, and 450 inside off angles, and straight-flex inside off angles. It can also be used to apply a final coat on drywall nails and screws.


  • Hinged door allows the flat box to open wide for easy clean up
  • Fits most style flat box handles
  • Bead wheels
  • Hand made from U.S. billet aluminum and steel components
Also compatible with: 
 ✓ NorthStar™ 
 ✓ TapeTech®  
 ✓ Drywall Master  
 ✓ BlueLine  
 ✓ Concorde  
 ✓ TapeMaster®