What size or kind of screw does the "chick-U-bator " use ?

[IwannaBEaMERMAID]

I lost the little screw that holds the light to the bottom half and cant find one that fits right

( i was cleaning it and the wind blew it in the grass )

wat size is it so i can go buy one at home depot

Please help

I was gonna start incubating today or tomarrow

 

[IwannaBEaMERMAID]

Please Help