Heller bionic pro sds plus hammer bits heller 19447 1 these 10 x 100 x 100mm bionic pro sds plus hammer bits from heller have rounded cutting edges and an innovative spiral design which provides efficient removal of drilling dust supplied in packs of 10 heller 19447 1 2018 bionic pro sds plus hammer bit 10 x 100 x 100mm pack of 10