The irwin hss pro titanium drill bits are primarily designed for drilling metal and harder tougher alloys compared to traditional hss twist drill bits speed can be increased by 40 60 and feed by 10 20 without reducing the life time of the drill bit significantly ti n is also a poor conductor of heat so the heat generated during the drilling process is diverted into the chips and coolant and less into the drill bit these drills have a 135 split point grinding tip which ensures perfect centring