Wilton Rectangle Cooling Grid, Multicolor, 3.52 x 39.08 x 52.8 cm

how is big for the grid hole ?. i do not want the grid hole is too big for food not gets through it IN case. thanks. please help me idea

Does this fit into a two thirds (15x21) sheet pan?

Does Wilton still make these in stainless, instead of chrome?

Can I use it as a rack in the oven