5Pcs Step Drill Bit Set 4 Spiral Flute HSS Bits 1 8in 1 3 8in with 1 4in 3 8in Hex Shank for Stainless Steel Aluminum

Feature: 1. ACCURATE DESIGN, POWERFUL PERFORMANCE: The four flute helical step drill bit outperforms the standard double flute drill bit, ensuring maximum cutting stability, more fast chip removal speed and longer drill bit life. The upgraded design minimizes swing and heat accumulation, ensuring cleaner holes and unparalleled accuracy even when drilling stainless steel and hardened metals 2. LONG LASTING AND WEAR PROOF: The five piece set of step drill bit assembly is made of quality high speed steel(HSS) and treated with a long lasting nitriding coating, featuring outstanding hardness, wear proof and long lasting durability 3. COMPLETE SPECIFICATIONS, PORTABLE USE: This multi functional step drill bit set includes 5 quality high speed steel drill bits with diameters of 3 16in 1 2in(6 steps), 1 8in 1 2in(13 steps), 1 4in 3 4in(9 steps), 3 16in 7 8in(12 steps), and 3 16in 1 3 8in(19 steps). Each drill bit is equipped with a 1 4in or 3 8in hex handle to ensure compatibility with most standard electric drills and impact wrenches. The set is neatly stored in a long lasting blow molded toolbox, which is convenient to carry and can be quickly accessed during work 4. CLEAR SCALES, INCISIVE AND ACCURATE: Each step drill bit is marked with etched size markers, which remain clearly visible even after long term use, eliminating the need for guessing or measuring. The incisive cutting side and balanced design ensure that each drilling session is glossy, effortless and accurate 5. MULTI SCENARIO APPLICABILITY: The step drill bit is highly suitable for drilling in stainless steel, copper, aluminum, wood, plastic and carbon steel. Whether you are doing home decoration, car repair or electrical installation, this set of step drill bits is an important tool for manual enthusiasts, professionals and repairmen Specification: Item Type: Step Drill Bit Set Material: High Speed Steel (HSS) Shank Type: Straight (1 4in and 3 8in hex shank compatibility) Slot Type: Spiral, four flute design Step Length: 3 16in 1 2in (6 steps) 1 8in 1 2in (13 steps) 1 4in 3 4in (9 steps) 3 16in 7 8in (12 steps) 3 16in 1 3 8in (19 steps). Package List: 5 x Drill Bits 1 x Storage Box