Woodtek 114419, Bits, Drill And Boring, Forstner, 1-5/8" Stainless Steel Forstner Bit Resist corrosion and keep sharp edges in harsh environments. Specifications: Cut Diameter=1-5/8 in, Material=STAINLESS STEEL, Overall Length=3-1/2 in Specifications: Shank Diameter=3/8 in