Check the listing for details. Walter 2.5mm Dia. × 70mm OAL HSS Multi-diameter Step Drill Qty 2 K6222-3.4. Condition: New. Listed at 44.80 USD. Overall Length (OAL) 70 mm Shank Type Round. Decimal Equivalent 0.1339″ Cutting Edge Material HSS. Item QTY 2.