Building materials of metal, namely, access hatches, fire-resistant access hatches, explosion release control access hatches, roof access hatches, ceiling access hatches, floor access hatches, wall access hatches, ladders, stairs, folding step ladders, roof access hatch combinations comprising roof access hatches and folding ladders sold as a unit

Building materials not of metal, namely, access hatches, fire-resistant access hatches, explosion release control access hatches, roof access hatches, ceiling access hatches, floor access hatches, wall access hatches; non-metal ladders; non-metal stairs; non-metal folding step ladders; non-metal building materials, namely, roof access hatches

Building materials of metal and transportable buildings of metal