Comparison : Item # Z450505, Phillips Pan Head Machine Screws, National Coarse, Zinc Plated Steel (1/4"-20)
Item # Z450510, Phillips Pan Head Machine Screws, National Coarse, Zinc Plated Steel (1/4"-20)
Item # Z450515, Phillips Pan Head Machine Screws, National Coarse, Zinc Plated Steel (1/4"-20)
Item # Z450520, Phillips Pan Head Machine Screws, National Coarse, Zinc Plated Steel (1/4"-20)
Item # Z450525, Phillips Pan Head Machine Screws, National Coarse, Zinc Plated Steel (1/4"-20)