High quality steel hex wrenches, in fractional sizes. Black oxidizing protects against rust and corrosion. Designed for use with auto, industrial, electronic, household and hobby. 7 piece set includes 050, 1/16, 5/64, 3/32, 1/8, 5/32, 3/16, 7/32, 1/4, 5/16 and 3/8" sizes.