Carded Forstner Bits Our Forstner Bits were stacked up against the best bits in the world. An independent testing lab proved that the Steelex® brand cut was equal to or better than Forstner Bits from Austria, known for being the best. Though primarily designed for drill presses, the smaller diameter bits can be used in portable drills. Sizes range from 1/4" to 2-1/8"