Features:1.Wood Countersink Drill Bit Set: Included 5 Pieces Drills, 5pcs Chamfer, and 1pc wrench.2.Function: The drill bit is high-speed steel HSS4241, the chamfering device is 45 steel, and the chamfering device is equipped with an adjustment screw to control the drilling depth.While drilling, it also takes into account the chamfering function, which is convenient and efficient.3.1/4 hexagon handle (6.3mm): Universal 1/4 inch hex shank prevents slipping in standard chucks and is compatible with all 1/4 inch quick-change chucks, including impact drills.4.Tapered drill: Tapered drill with widened flutes for drilling fast, clean holes and ensures tight fit for screws.5.With Wrench: Very convenient to change the bits with the included mini wrench which loosens and tightens the bits to hold and release as needed.Specifications:Material: (Drill) High Speed Steel, (Chamfering device) High carbon steelColor: blackHandle type: 1/4 hexagon handle (6.3mm/0.24inch)Specifications: 7/64, 9/64, 11/64, 3/16, 7/32Drill Size: (Approx) L 87mm/3.4inch, 93mm/3.6inch, 103mm/4.05inch, 110mm/4.3inch, 114mm/4.4inchChamfer Size: (Approx) 12.4x9.3mm/0.48x0.36inchPackage Included:5 PCs x Drills5 PCs x Chamfer1 PC x Wrench