Yakamoz 5pcs Taper Countersink Drill Bit Set, 1/4" Hex Shank Counter Sinker Tapered Drill BitsFeature: Drills, countersinks, and counterbores in one step. 7/32", 3/16", 11/64", 9/64", 7/64" Tapered countersink drill bit set. 4-flute counterbore in 82-degree chamfer angle for smooth cutting. Adjustable countersink along taper drill can control the pilot hole depth. Compatible with all 1/4 inch Quick change chucks, including Impact drills. Size are laser printed on each countersink shank, ideal for pre-drill and countersink. Made from M2 High-Speed Steel (HSS) for high toughness, wear resistance, and good cutting edge retention. Specification:Shank Size: 1/4" Hex ShankSize: 7/64", 9/64", 11/64", 3/16", 7/32" Material: M2 High-Speed Steel (HSS) Easy to UseStep 1: Rotate the Hex Wrench to adjust the length you need. Step 2: Insert the countersink bit into the drill. Please make sure the drill bit is clamped. Step 3: Vertical drilling the drill bit during the operation. The depth only needs to allow the screw head to sink below the surface. Package Included:5 x Countersink Drill Bit