Comparison : Item # Z440020, Slotted Pan Head Machine Screws, National Coarse, Zinc Plated Steel (4-40)
Item # Z440025, Slotted Pan Head Machine Screws, National Coarse, Zinc Plated Steel (4-40)
Item # Z440030, Slotted Pan Head Machine Screws, National Coarse, Zinc Plated Steel (4-40)
Item # Z440035, Slotted Pan Head Machine Screws, National Coarse, Zinc Plated Steel (4-40)
Item # Z440040, Slotted Pan Head Machine Screws, National Coarse, Zinc Plated Steel (4-40)