Heller trijet sds plus hammer bits heller 26771 7 this 12 x 600 x 550mm 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 26771 7 2618 trijet sds plus hammer bit 12 x 600 x 550mm single