⭐【Material】The Twist Drill Bit is made of high speed steel with high hardness, durability and wearness. ⭐【Dimension】Shank Diameter : 12.7mm/1/2 inch; Drilling Diameter : 14.5mm/0.57''; Total Length : 153mm/6 inch. ⭐【Quick Drilling】Split Point tip starts on contact to keep the bit from walking for fast accurate holes. ⭐【Straight Shank】Straight shank design is more suitable for many electric drills, Sharp and twisted flute will make the drilling be more easy and effortless. ⭐【Applicable Material】Excellent for drilling on both flat and curved surfaces such as stainless steel and cast Iron.