CO-Z Large HSS Spiral Groove Step Drill Bit, 12 Sizes Titanium High Speed Steel 1/4" to 2-3/8" Drill Bit for Sheet Aluminium Metal Wood Hole Drilling, Big Multiple Hole Stepped Up Bit for DIY Lovers: Industrial & Scientific

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See more product details Laser-engraved reference marks on each bit offer superb convenience and accuracy, ideal for drilling large and small-diameter holes in metal and plastic. For high-efficient drilling, thickness of sheet metal shall be less than that of each step. Compatible with 1/4, 3/8, 1/2 electric drills or bench drills, but only work for sheet metal, aluminum or plastic. X-type openings design to facilitate the removal of cutting waste when drilling, preventing iron chips or sawdust from scattering and ensuring sleek & accurate drilling.

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