Roofing Screw Nails are also known as Pallet nails,Spiral Thread nails, Roofing Thread nails or Assembled Roofing nails. Roofing Screw Nails are widely used for jointing wood, roof board, roofing sheet and tightening wood or iron sheet. Typical size for the roofing screw nails (Size:Length x Diameter ) : LENGTH LENGTH DIAMETER DIAMETER Inch m/m BWG MM 2" 50 12/11 1.2/3.0 2 1/2" 64 11/10 3.0/3.4 3" 76 10/9/8 3.4/3.8/4.2 3 1/2" 88.9 10/9/8/7 3.4/3.8/4.2 4" 100 8/7/6/5 4.2/4.6/5.2/5.6 4 1/2" 114.3 7/6/5 4.2/4.6/5.2/5.6 5" 126 6/5 4.2/4.6/5.2/5.6 6" 150 6/5 4.2/4.6/5.2/5.6