Mezzanine decking

Metal Channel Grating or Decking, 256 sq. ft., sections are 9" wide X
2-1/2 tall and up to 16 feet long. These are an easy-to-install system
of interlocking galvanizeed metal treads . Use for stair treads,
mezzanine floors, rooftop walkways, drains in sidewalks or driveways,
trailer fenders, steps into your semi, many applications. Performance
is increased because the "planks" interlock. Hundreds of sole-gripping
dimples and ventilated "ovals" ensure a safe surface in all kinds of
environments.