HSS cobalt step drill bit set 3 pieces 4-32mm nitrogen gas metal cone high-speed spiral steel triangular handle metal dril

3 PCS Metric HSS Titanium Nitride Coated Step Drill Bit Set Specifications: Package Included:3pc Hss Step Cone Drill Bit Titanium Hole Cutter Set Maximum drilling depth (mm):5 Finish: Titanium plating Cutting materials: thin iron plate, aluminum, insulation board, PVC board that thickness is within 5mm Material: HSS (Suitable for use in the hardness below 25 degrees workpiece, such as carbon steel, the thickness of the plate of step is 5mm). High speed, titanium nit-ride coated steel Replaces 28 separate drill bits Two fluted design for fast, smooth cutting.  When inject cold water while working, can effectively extend the service life of the drill bit. Recommend drilling rate of 250-250 RPM. Purpose: Such as carbon steel plate, sheet iron, insulation boards, wood. Cannot be used for stainless steel.  MEASUREMENT: 4-12 5 Steps (Diameter 4, 6, 8, 10, 12mm) 4-20 9 Steps(Diameter 4, 6, 8, 10, 12, 14, 16, 18, 20mm) 4-32 15 Steps(Diameter 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32mm) About Payment1.Orders processed timely after the payment verification.2. Full payment must be made within 7 days after placing your order, or the order will be invalid or canceled by the system.3. Make sure that you have completed all the detailed information like contact person,address,post code and telephone number when filling in your buyer's information.Shipment and Delivery1.Singapore post : About 15-35 Days to arrive,2.China Post Air Mail : About 15-90 Days to arrive.3.DHL:About 5-15 Days to arrive4.EMS:About 7-15 Days to arrive About Feedback1.Buyer's early confirmation will be highly appreciated after receiving the items.2.Since your feedback is very important to our business's development, we sincerely invite you to leave positive feedback for us if you are satisfied with our product and service. It'll just take you 1 minute,but this 1 minute has the extremely vital significance to us.3.Please contact us before leaving any negative or neutral feedback. We will work with you to solve any problems.'