The Genius Tools 20-Piece Hex Nut Driver Set, No. ND-020MS, includes metric sizes from 4 mm to 13 mm and SAE from 3/16" to 1/2". Made of chrome vandium steel, each 14 cm driver comes color coded for easy identification with special coating for corrosion resistance. Made of chrome vanadium steel, the set also includes a ratcheting screwdriver and comes in a plastic molded case.