Zinc-plated for corrosion resistance. PZD countersunk head self-tapping screws. Includes assorted metric sizes: 3 x 12, 3.5 x 16, 3.5 x 19, 4 x 16, 4 x 19, 4 x 25, 4 x 30 and 5 x 30mm. Handy storage case with compartments.