Jumbo 2-3/8 Unibit Step Drill Bit for Metal, Extra Large Drill Stepper Bit for Hard Metal Heavy Duty, 12 Sizes from 1/4 to 2-3/8, Spiral Grooved, C5BK

DURABLE AND STRONG: Durable high speed steel with black coating ensures durability and sharpness, reduces friction, runs cooler, resists heat, corrosion and rust, and extends the life of the cutting edge even in extreme temperatures
EXTRA LARGE STEPS DRILL: Shank diameter is 13 mm (1/2 inch), use one step drill to drill different sizes of holes, much more convenient than using multiple drills, ideal for DIY projects in home, garden, workshop
HIGH PERFORMANCE: Split tip is at 118 degrees for better wear resistance. Double helix blade design makes smoother cuts, easier to dislodge material particles and cleaner drilling operations, can be used with electric drills, rechargeable drills and more