Bosch metal drills suitable for steel alloy and non alloy with resistance to the maximum tensile 900 nmm cast steel cast iron sintered iron malleable iron non ferrous metals hard plastics precision drill hss g is characterised by a higher drilling rate of 40 than the hss drills with a standard ground conical finish and a lower thrust force of 50 the tip split point makes any score or pilot hole redundant up to 10 mm hss g drill bits are available in two qualities topline for extre