31/64" Tin Coated Jobber Length Drill Bit. Tin coated jobber drills have super hard titanium nitride surface treatment improves drill life, chip ejection, and productivity; decreases horsepower requirements. Ideal for hard metals, work hardened stainless and other difficult to drill materials. '-- While we are happy to sell this product in any quantity you desire, we prefer this item be purchased in multiples of 6 in order to not break product packaging.