Sherwood Jobber drills have a ground shank, induction hardened and tempered alloy steel construction. Suitable for drilling steels, cast steel, grey cast iron, malleable cast iron, nickel brass, aluminium alloy and graphite. Industrial quality construction with ground flutes, blue finish. Supplied in indexing metal cases Features: High-speed steel with industrial quality construction for added toughness Ground flutes for greater cutting precision Supplied in indexing metal cases for quick and easy tool selection and portability Content: 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0mm