Step Drill Bit for Metal, 7/8" to 1-3/8", Cobalt Step Drill Bits, Heavy Duty for Stainless Steel, Hard Metal, Aluminum, Copper, Industrial Grade, 5-Steps. Co138Z

Industrial-Grade Cobalt Step Drill Bit for Tough Metals The CO138Z Cobalt Step Drill Bit (7/8" to 1-3/8") is built for professionals who demand durability and speed when drilling through stainless steel, hardened metals, and thick alloys. Made with 3% cobalt steel (M2 grade), this 5-step bit delivers 5X longer lifespan and 2X faster cutting compared to standard HSS bits. Whether you're a mechanic, metal fabricator, or serious DIYer, this heavy-duty step bit powers through stainless steel, aluminum, and copper with precision. Heavy-Duty Construction – Built to Last 3% Cobalt Steel (M2 Grade) – Harder and more heat-resistant than standard HSS, ideal for stainless steel, galvanized metal, and cast iron. Tri-Flat Shank (3/8") – Locks securely in drill chucks, preventing slippage under high torque. 2-Straight Flute Design – Efficient chip removal reduces clogging and overheating. 5 Precision Steps (9/32" to 1-3/8") – Covers essential hole sizes for plumbing, automotive, and fabrication work.  Where & How to Use It – Professional Applications ✔ Stainless Steel Work – Perfect for sinks, exhaust systems, and structural brackets. ✔ Automotive & Heavy Machinery – Drills tractor buckets, loader arms, brake rotors, and lug bolts effortlessly. ✔ HVAC & Plumbing – Cuts clean holes in copper pipes, steel tubing, and PVC. Pro Tips for Best Performance: Secure the workpiece – Use clamps for metal to prevent vibration. Start slow, then increase speed – Best for stainless steel & hard alloys. Apply cutting oil – Extends bit life and reduces friction. Clear metal chips regularly – Prevents clogging for smoother drilling. Engineered for Professionals – No Compromises This CO138Z Cobalt Step Bit is not a disposable tool—it’s built for hard work. Designed for welders, mechanics, and metalworkers, it outperforms standard bits and drills through stainless steel like a hot knife through butter. Stop wasting time with cheap bits that dull quickly—upgrade to industrial-grade performance today.

• 【Heavy Duty for Stainless Steel】 The Cobalt Drill Bits(M2+3%Cobalt STEEL) can drill 5X longer life and 2X faster. This Cobalt Drill bits is heavy duty for Stainless Steel, Metal, Galvanized Steel, Aluminum,Iron, Wood, PVC and Copper. This steel drill bit is tough,sharp and can drill many holes on hard metal like a Work Horse!
• 【Cobalt Drill Bits】Prefect for Stainless Steel/Metal Sheet/Wood/Plastic/Aluminum Sheet/Copper and other metal sheets. This Drill bit can successfully drill more and more holes easily into Stainless Steel plate like knife through butter
• 【A Work Horse】This spiral shaped step bit is a work horse. Easily drilled through the steel platform of your zero-turn mower, cold rolled steel, lug bolt, old rack, iron rotors, tractor bucket, washer, heavy steel loader bucket was made for a tractor, hydroponics tubing,water pipe, cabinet
• 【5 Steps︱2-Straight-Flute︱3/8" Shank】 6 steps: from 9/32", 7/8", 1-1/8", 1-7/32", 1-1/4" to 1-3/8". 2-Straight-Flute:Clears Chips faster
• COBALT DRILL BIT / HEAVY DUTY for SS / (7/8" to 1-3/8")