Heller bionic pro sds plus hammer bits heller 19452 5 these 14 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 5 heller 19452 5 2018 bionic pro sds plus hammer bits 14 x 150 x 150mm pack of 5