Heller Tools' ProXtreme 28657 2 is a carbide metal concrete twist drill bit with a 6 mm diameter and a total length of 250 mm featuring a triangular shank. It is ideal for applications involving stone, masonry, and brickwork. This high-quality drill bit is designed for efficient and precise drilling in concrete and other hard materials. https://elecena.pl/product/28930145/heller-28657-proxtreme-concrete-twist-drill-bit-6mm-triangular-shank 2025-06-10 https://elecena.pl/product/28930145/heller-28657-proxtreme-concrete-twist-drill-bit-6mm-triangular-shank 2026-05-04