HomeHome & GardenWood Craft3Pcs/set 3-12 4-12 4-20 4-32mm HSS Straight Groove Step Drill Bit Titanium Coated Wood Metal Hole Cutter Core Drilling Tools Set 3Pcs/set 3-12 4-12 4-20 4-32mm HSS Straight Groove Step Drill Bit Titanium Coated Wood Metal Hole Cutter Core Drilling Tools Set