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 38big 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 Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List 1Adopted of 9341 high-quality steel forging, and head is treated by quenching, which is high hardness and good wear resistance 2135Double back Angle design design makes cutting sharp 338big spiral Angle design, increasing the chip cutting groove 4Standard 1/2 inch round shank for wide applicability 5Multiple drilling diameter is available