Draper Screwdriver and Magnetic Bit Set (8 Piece)25mm 1/4" bits manufactured from chrome vanadium steel, hardened and tempered with a shot blast finish. Supplied in a convenient storage case, which opens up for easy access to the bits. The magnetic bit holder is made from a zinc alloy steel with chrome plated finish.PRODUCT DIMENSION:Height (mm) :172Width (mm) :132Depth (mm) :22