Aluminum Case Metal Core Drill Bit Tool

5Pcs With Aluminum Case/Opp bag: Description: Material: High Speed Steel 4241 (Suitable for workpieces with hardness below 25 degrees)Cutting material: Thin iron plate, aluminum material, insulating board, PVC board wood ( the recommended thickness is within 5mm) Features: 5 piece step drill bits set replaces 50 individual drill bits which saves you a lot of trouble and space,Two-flute design gives you faster, smoother cutting. Large bit has 3-sided shank and small bits have hex shank to prevent slip in drill chuck1. This is a new type of HSS 4241 steel large step taper drill cobalt coated to reduce friction and run cooler2. Cobalt steel with titanium coating ensures the bits have exceptional durability and will stay sharp for many years.3. It is very suitable for cutting holes in various materials, including carbon steel, brass, wood, plastic, etc.4.The bits come supplied in an organized aluminum case for easy storage and transport.5.This set is a must-have for HVAC profes