Heller bionic pro sds plus hammer bits heller 19446 4 these 8 x 150 x 150mm 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 19446 4 2018 bionic pro sds plus hammer bits 8 x 150 x 150mm pack of 10