5.5mm Heller SDS TriJet rebar cutter Hammer Drill Bits for Concrete, Brick & Stone. A premium choice in SDS drill bits. The Tri-Jet Drill Bits have a patented Tip for fast drilling and cutting through smaller rebar in concrete. Heller produce the Tri-Jet Drill bit from 5mm to 16mm diameter and up to 600mm long. For over 16mm they produce the Y-Cutter in the premium range.