Comparison : Item # S720575, Stainless Steel Flat Head Socket Cap Screws, National Coarse (1/2"-13)
Item # S720580, Stainless Steel Flat Head Socket Cap Screws, National Coarse (1/2"-13)
Item # S720585, Stainless Steel Flat Head Socket Cap Screws, National Coarse (1/2"-13)
Item # S720590, Stainless Steel Flat Head Socket Cap Screws, National Coarse (1/2"-13)
Item # S720595, Stainless Steel Flat Head Socket Cap Screws, National Coarse (1/2"-13)