Woodtek 109067, Bits, Drill And Boring, Forstner, 1 1/4" Carbide Tipped Forstner Bit Carbide forstner bits offer durable performance in tough materials. Specifications: Cut Diameter=1-1/4 in, Material=HIGH SPEED STEEL, Overall Length=3-1/2 in Specifications: Shank Diameter=3/8 in