24 Pieces Hex Shank Drill Bit Set For Impact Driver, Hss Twist Titanium Drill ?Package Size? Size range: 1/16"x3, 5/64"x2, 3/32"x2, 7/64"x2, 1/8?x2, 9/64", 5/32"x2, 11/64", 3/16"x2, 13/64, 7/32, 15/64, 1/4, 5/16, 3/8, 1/2. Most frequently used size range with extra small size drill bits. All drill bits are kept in a strong and professional plastic case with indexed holder which is convenient for storage and pick-up. ?Wide Applications? Jefe Hex drill bit sets are built for general purpose applications, such as DIY projects, home maintenance and MRO (Maintenance, Repair and Operations). Working materials include steel, copper, aluminum, zinc alloy, cast iron, wood and plastics. ?HSS Titanium Coating?High speed steel (HSS) with titanium coating gives Jefe Hex drill bits great durability and prolongs 3 times longer life than drill bits without coating. ?135 Degrees Split Point and Parabolic Flute?Jefe Hex Easy Cut Split Point design makes drilling easy with less pressure and prevents drill bits walking on the working surface. Fully ground modified parabolic flute design clears chips quickly, decreases friction and heat damage. Tapered web provides durability and reduces breakage. ?Quick Change Solid Hex Shank?1/4" (6.35mm) hex shank fits into standard power tools and impact drivers. Jefe Hex drill bit?s solid bonding technology eliminates radial runout and improves concentricity. High torque, impact-rated accuracy.