Heller trijet sds plus hammer bits heller 26742 7 this 55 x 110 x 50mm trijet sds plus hammer bit from heller is part of a new generation of hammer bits designed to give powerful fast and consistently high performance made from extremely wear resistant tungsten carbide alloy for a long service life supplied singly heller 26742 7 2618 trijet sds plus hammer bit 55 x 110 x 50mm single