Whiteside DH20-70LH LH Hinge Boring Bit, 10mm SH X 20mm CD is a high-quality left-hand hinge boring bit designed for precision and durability. This production-quality Forstner-style boring bit features a centering point and two straight carbide cutters that create ly flat and smooth bottomed holes. Additionally, it includes two carbide spurs to eliminate tear out, ensuring clean and accurate cuts every time. The shank has a flat on one side for secure installation. Please note, this bit is specifically designed for use in a boring machine with a left-handed rotation and is not suitable for use in a drill press or router. With a 10mm shank size, 20mm cutting diameter, and 70mm overall length, it delivers reliable performance for your woodworking needs. Whiteside Machine Company, based in Claremont, North Carolina, manufactures this precision tool. Model Number: DH20-70LH