Shop › EcoPower 3mm "High Strength" Steel Socket Head Cap Screws (10) (3x40mm) EcoPower 3mm "High Strength" Steel Socket Head Cap Screws (10) (3x40mm) $2.99 This is a pack of EcoPower 3mm "High Strength" Steel Socket Head Cap Screws. This is a pack of EcoPower 3mm "High Strength" Steel Socket Head Cap Screws. Quantity: Add To Cart Added!