Features 【M35 cobalt】Quality M2 HSS with 5% cobalt added for higher hardness and heat-resitance. The Rockwell hardness is up to 67. It can cut faster and has a long life, up to 12 times compared with the average HSS bit. 【Self centering】The guiding separation point of 135° rapid cutting is self centering, which can penetrate quickly with less pressure. The straight handle can be firmly fixed and accurately centered, which is suitable for standard bit chuck and conventional round chuck. 【Keep Efficient】Efficient drilling without walking. Remove chips and particleseasier and faster. Drill directly to the size needed without pre-drilling. 【Fully Ground】 Heavy-duty fully ground body construction for minimal burr and accurate diameter. 【Application】Bits for metal. Suitable for drilling non-heat treated metals, of which the hardness is less than HRC38, such as stainless steel, copper cast iron, galvanized pipe, iron, and aluminum alloy. Specification: Material: HSS-Co M35 Cobalt Size(mm):1.5-6.5mm(1.5, 2.0, 2.5, 3.0, 3.2, 3.5, 4.0, 4.5, 4.8, 5.0, 5.5, 6.0, 6.5mm) Color: Gold Product Name: M35 Cobalt Twist Drill Bits Set Shank Type: Straight Shank Measurement: System Metric Package List: 13pcs HSS Cobalt M35 Twist Drill set 1Pc Metal Case Package List