Heller Tools manufactures the ProXtreme 28658 9, a carbide metal concrete twist drill bit with an 8 mm diameter and a total length of 250 mm, featuring a triangular shank. This robust bit is suitable for stone, masonry, and brickwork drilling applications. It is ideal for professional use where precision and durability are required. https://elecena.pl/product/28930144/heller-28658-proxtreme-concrete-drill-bit-8mm-250mm-triangular-shank 2025-06-10 https://elecena.pl/product/28930144/heller-28658-proxtreme-concrete-drill-bit-8mm-250mm-triangular-shank 2025-06-30