These are the mite trays that come with our Screened Bottom Boards. The corrugated plastic is standard and will certainly suffice, but the poly-metal is extremely durable and comes with a UV resistant zip tie. It is the same material we use on our curved lids.
The 10 frame corrugated measurements are: 13-3/4" wide by 20-1/4" long.
The 10 frame poly-metal measurements are 1/16" wider at 13-13/16" by 20-1/4" long
The 8 frame corrugated measurements are: 11-5/16" (just over 1/4") wide by 20-1/4" long.
The 8 frame poly-metal measurements are 2/16" wider at 11-7/16" (just under 1/2") by 20-1/4" long.
Mite trays often vary in sizes, so please measure before buying. If it does not fit you can return it (at your own cost, if shipping) as long as it is in the same condition as when purchased.