HOHXEN Spiral Grooved Step Drill Bit[4mm-12mm, 9 Steps], High Speed Steel 4241 Titanium Coated, 1/4'' Hex Shank, HSS Cone Drill Bits Cut Tool Set for DIY Plastic Wood Metal Aluminum Copper PVC Board

• 🆗【SPIRAL GROOVED STEP DRILL BIT】- Material: High-speed steel 4241; Surface Treatment: Titanium coated; Shank Diameter: 6.35mm (1/4'' hexagon shank); 4-12mm, 9 Steps: 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm; Length: Approx. 67mm/ 2.60"; Fibre optic marking with clear lettering and diameter at a glance. A variety of drill sizes are perfect for your needs, saving you time.
• 🆗【SUPERIOR QUALITY MATERIAL】- Marked 4241, 6542, M35 are high-speed steel (HSS); 4241 material is used for wood, plastic, thin iron plate, thin aluminium plate opening; 6542 material is used for iron plate, steel plate opening; M35 material can be used for iron, steel, stainless steel sheet and other hardness of the material opening.
• 🆗【UNIQUE STEP STRUCTURE】- A drill can open a variety of sizes of holes, a step drill can be worth a box of drills; Compared with ordinary twist drills are not easy to break, small shake. Deburring, chamfering, round hole expansion, twist drills can not complete the work, these Pagoda step drill can complete it into.
• 🆗【FEATURES OF AUGER BITS】- Double drain grooves, fast chip removal, reduce cutting resistance, improve working efficiency; Universal hexagon shank is not easy to slip, not easy to slip, stronger and more durable; Self-centering easy to locate, 118 ° X-type opening design, effectively reduce the bit slippage.
• 🆗【WIDLY APPLICATION】- Step Drill Bit can be used for workpieces with a hardness of less than 25° and a thickness of less than 5mm. Applicable materials: iron, aluminium, wood, plastic, stainless steel, carbon steel, insulation boards, PVC boards; Recommended tools: hand drill, electric drill, table drill.

🆗 STEP DRILL BIT SIZE 🆗 9 STEPS(4-12mm) 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm Length: Approx. 67mm/ 2.60"  🆗 SPECIFICATIONS 🆗 Material: High-speed Steel (HSS 4241) Surface Treatment: Titanium Coated Shape of Shank: Hexagonal Shank Diameter: 6.35mm (1/4 Inch Hex Shank)  🆗 FEATURES 🆗 100% Quality And Brand New. Automatically Deburrs Holes As You Drill Two-Flute Design Gives You Faster, Smoother Cutting Titanium Nitride Coating For Cooler Running Quick-Change 1/4" Hex Shank High Speed Steel For Long Life These Step Drill Bits Are Ideal For Variety Of Materials From Metal, Plastic, Fiberglass To Wood They Also Help To Enlarge Existing Holes The Two Flute Design Tips Made The Penetration Faster Without Chipping The step drill bits are best used on thin materials. Since one step drill bit can change to a number of different sizes, time is saved by using them with sheet metal work. Another purpose of step drill bits is to use them as countersinks. Another great use for step drill bits is on auto repair projects.  🆗 USER INSTRUCTION🆗 1) Star drilling at low speed. Do not push too much. Let the drill bit to cut by itself. The harder the material it is working with, the lower speed shall be applied. 2) Inject coolant oil while working, it will dramatically increase the drilling efficiency and extend the drill bit life time. 3) Drill bits are good for wood, plastic, steel and sheet metal drilling. Stainless steel is not recommended.  🆗 PACKAGE INCLUDED 🆗 1 Pcs 4mm-12mm Spiral Grooved Step Drill Bit