Features 1. M35 cobalt. Quality M2 HSS with 5% cobalt added has a higher hardness and heat resistance. The Rockwell hardness is up to 67, the cutting speed is high and the tool life is 12 times longer than conventional HSS drills. 2. Self-centering. 135 ° quick cut guide Cutting point self-centering, fast penetration, low pressure. The cylindrical shank can be firmly fixed and precisely centered, suitable for standard drill chucks and conventional round chucks. 3. Efficient drilling, no walking required. Easier and faster removal of dirt and particles. 4. The lowest drilling costs. The solid cobalt steel drill body can be reground. 5. Split point. Drill directly to the desired size without pre-drilling Features: 1. M35 cobalt. Quality M2 HSS with 5% cobalt added has a higher hardness and heat resistance. The Rockwell hardness is up to 67, the cutting speed is high and the tool life is 12 times longer than conventional HSS drills. 2. Self-centering. 135 ° quick cut guide Cutting point self-centering, fast penetration, low pressure. The cylindrical shank can be firmly fixed and precisely centered, suitable for standard drill chucks and conventional round chucks. 3. Efficient drilling, no walking required. Easier and faster removal of dirt and particles. 4. The lowest drilling costs. The solid cobalt steel drill body can be reground. 5. Split point. Drill directly to the desired size without pre-drilling 6. Fully grounded. The heavy-duty, fully ground body structure minimizes burrs and precise diameters. 7. Metal drill. Suitable for drilling non-heat treated metals with hardness less than HRC38, such as stainless steel, cast copper, galvanized pipe, iron, aluminum alloy, etc. Specification: Material :M35 HSS Size (optional)             19PCS: 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0mm   Package included: 19PCS Drillpro M35 Cobalt Drill Bit Set 1 PC Metal Case Package List