Heller bionic pro sds plus hammer bits heller 19444 0 these 8 x 50 x 50mm 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 19444 0 2018 bionic pro sds plus hammer bits 8 x 50 x 50mm pack of 10