The Prefix, with the SDS-plus shank, is a reliable entry-level hammer drill bit that Heller has added to its product range. This duo cutter, which is equipped with robust carbide tip, is suitable for all concrete and stone cutting applications. The aggressive tip and helix design guarantee effective drilling dust removal. Low vibration and the integrated centring tip make it easier to work with this drill bit, which is also available at a low entry-level price.