Choose from 5 different machine screws. sold in 1000 packs. please message for bulk quantities.
Nickel Plated. 
#4-40 x 9/32" Slotted Flathead 
#6-32 x 3/8" Philips Flathead
#8-32 x 7/16" Slotted Flathead
#10-32 x 1/2" Slotted Flathead
#1/4-20 x 5/8" Slotted Flathead