Comparison : Item # Z400610, Slotted Round Head Machine Screws, National Coarse, Zinc Plated Steel (5/16"-18)
Item # Z400615, Slotted Round Head Machine Screws, National Coarse, Zinc Plated Steel (5/16"-18)
Item # Z400620, Slotted Round Head Machine Screws, National Coarse, Zinc Plated Steel (5/16"-18)
Item # Z400625, Slotted Round Head Machine Screws, National Coarse, Zinc Plated Steel (5/16"-18)
Item # Z400630, Slotted Round Head Machine Screws, National Coarse, Zinc Plated Steel (5/16"-18)