Features 1、Adopted of 9341 high-quality steel forging, and head is treated by quenching, which is high hardness and good wear resistance 2、135°Double back Angle design design makes cutting sharp 3、38°big spiral Angle design, increasing the chip cutting groove 4、Standard 1/2 inch round shank for wide applicability 5、Multiple drilling diameter is available Specification Features: Adopted of 9341 high-quality steel forging, and head is treated by quenching, which is high hardness and good wear resistance 135° double back Angle design design makes cutting sharp 38°big spiral Angle design, increasing the chip cutting groove Standard 1/2 inch round shank for wide applicability With a sturdy box for safe organize and storage Multiple drilling diameter is available Specification: Name: 1/2-inch shank 9341 steel twist drill Material: 9341 steel Handle diameter: 1/2 inch Size: 14mm,14.5mm, 15mm, 15.5mm(Optional) Weight: Approx.117g~129g/4.1oz~4.6oz Package list: 1 x HSS Twist Drill Bit with box Package List