They are plated and coated with zinc for corrosion resistance and durability

Hex Head Screw - Box (300) features a 0

1/2-20 x 4 1/2 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (125)

9/16-12 x 2 1/4 Grade 8 Hex Cap Screw Yellow Zinc Plated Domestic USA (200)

1-8 x 3 1/2 A325 Type 1 Heavy Hex Bolt Plain - Bulk Keg (200) SDS Max Hammer Drill Bits They are plated and coatedThese 1 8 x 3 1 2 A325 Type 1 Heavy Hex Bolts are perfect for heavy duty projects requiring maximum strength, featuring a large bearing surface for even pressure distribution. With 200 bolts in a convenient bulk keg, you'll be ready to tackle any job big or small.