Drawing upon years of experience in making the highest quality forstner bits and forstner bit sets available, Convalco Forstner Bits are the closest wood boring bits on the market to the original forstner bit developed 120 years ago. Convalco Forstner Bits are designed with more weight than most other forstner bits which allows them to be run at higher speeds. Because they are heavier the heat from prolonged use is dispersed causing less burning of material. Machined from solid steel then hand sharpened, Convalco Forstner Bits have a distinct advantage over diecast wood boring bits. Resharpening is available from Convalco, thus insuring a longer life, and longer lasting edge. These forstner bits are guided by their circular rim instead of their center, and consequently will bore any arc of a circle and can be guided in any direction regardless of woodgrain or knots. Bores a TRUE flat bottom hole, with very little dimple. Convalco Forstner Bits are overall professional quality wood boring bits, which deliver longer, more accurate cutting time from a truly authentic American made tool.