HSS 4241 Cobalt Multle Hole Step Drill Bit Set Tools Aluminum Case Metal

Descrtion: Material: High Speed Steel 4241 (Suitable for workpieces with hardne below 25 degrees) Cutting material: Thin iron plate, aluminum material, insulating board, PVC board wood ( the recommended thickne 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 sl in drill chuck 1. This is a new type of HSS 4241 steel large step taper drill cobalt coated to reduce friction and run cooler 2. 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, bra, wood, plastic, etc. 4.The bits come supplied in an organized aluminum case for easy storage and transport. 5This set is a must-have for HVAC profeionals and DIY enthusiasts. 6.Aluminum Box Package Size: 15cm * 10.5cm * 4.2cm (L * W * H) Weight: 450g Package includes: 1.Black set with box or 2.Black set without box or 3.Gold set with bag (4-124-20 4-32) or 4.Gold set without bag (4-124-20 4-32) Notice: 1. For the operation of hand drill (above 550W), the thickne is 1-2mm, and the hole diameter is greater than 14mm, a bench drill is required. (It is recommended to drill the workpiece with a stainle steel hardne below 25 degrees) 2. During drilling operation, water is injected while drilling to cool down, which effectively prolongs the service life of the drill. (Recommended speed 250~400)

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