ToolUSA 7 Piece Square Shape Disc Cutter With Handle: TJ750H-SQ-7 Set Of 7 Solid Steel Square Shaped Cutters In A Variety Of Sizes Plus The Plate With Handle Square Cutters In Sizes 4x4, 6x6, 8x8, 10x10, 12x12, 14 X 14, And 16x16mm-set Weighs 3 Lbs 13 Oz Handle Turns To Create An Opening Between The Two Plates Of Up To 1.9mm For The Sheet Metal The Handle Can Be Tightened Down To Hold The Sheet Metal In Place For Cutting A Good Strong Hit With A Hammer (not Included) Is The Final Step To Complete The Cutting