HUSQVARNA 541400070 - 12" Core Drill Bit Shaft Extension (5/8"-11)The Husqvarna 541400070 is a professional grade 12 inch (300mm) shaft extension specifically engineered for demanding core drilling applications. This industrial strength accessory allows operators to achieve deeper drilling depths without sacrificing stability or precision. Constructed from high tensile steel, it is designed to withstand the rigorous torque and vibrational stresses common in heavy duty concrete and masonry work. Equipped with a 5 8"