Master Mechanic, 5/16" x 4", 4341, High Speed Steel Drill Bit, 118 Point, Bright Silver Finish, Jobber Length, 1/4" Reduced Shank, Features 2 Cutting Edges & Polished Flutes, Recommended For Drilling Wood, Plastic, Wallboard, Plywood & For Moderate Use In Soft Metals, Brass, Bronze, Sheet Metal & Aluminum, Carded.