Milwaukee sds plus rx4 drill bits have an embedded solid one piece carbide centring tip for easy spot drilling and long lifetime four symmetrical 90 cutting edges guarantee perfect round holes for anchor fixing as well as reducing the risk of the drill bit jamming when hitting rebar the drill bits high volume flute geometry ensures optimum dust removal the 4 spiral flute design and thicker core body provide low vibration and low uniform flute wear suitable for drilling brick concrete reinforced