Heller trijet sds plus hammer bits heller 27227 8 these 12 x 160 x 100mm trijet sds plus hammer bits from heller are 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 in packs of 10 heller 27227 8 2618 trijet sds plus hammer bits 12 x 160 x 100mm pack of 10