- Heat Treated- Universal 1/4" Shank- For Working, Plywood, Wall Board, Hard Metals or Wood with Nails or MasonrySizes: 2 Each- 4" x 14 TPI: Pipe/Rebar (Metal)- 4" x 24 TPI: Metal- 6" x 18 TPI: Masonite- 6" x 7 TPI: Fast Cu