Negative supply kit parts question

I just bought the negative supply enthusiast plus kit from b&h and it’s missing the four socket head screws I need to secure the basic XL riser column into the basic rise XL base. Does anyone know the specs for the screws? Negative Supply’s customer service sucks (as I’ve seen other people on here also experiencing) and I’d rather get the screws myself at Home Depot if possible than wait around for them to respond to me.

Thanks in advance for the help!