⚡ Key features of the HSS imperial step drill set

• ⚙️ Premium high‑speed steel (HSS): Exceptional hardness and heat resistance for long service life even in stainless steel, alloy metals, and abrasive materials.
• 🌀 4‑flute black & white spiral: Smoother cutting action, rapid chip evacuation, and noticeably cleaner holes in metal, plastic, and wood – reduces binding and heat buildup.
• 🔩 Hex shank (1/4" / 6.35 mm): Universal fit for all power drills, impact drivers, and screw guns. The hex grip prevents cam‑out and slipping during high‑torque drilling.
• 📏 5 imperial step bits: Covers a wide range of hole sizes from 1/16" up to 1‑3/8". Ideal for electrical panels, conduit holes, auto repair, and ladder rack installation.
• 🥧 Integrated countersink / deburr: Each bit includes a dedicated chamfering section – quickly bevel holes for a professional flush finish. No secondary tools needed.
• 

📋 Technical specifications

• Countersink diameter indicates the largest hole that can be chamfered with that bit; actual chamfer size may vary depending on material thickness. The set includes five individual step bits, each with its own hex shank.

❓ Frequently asked questions

🛡️ Can these HSS step bits drill through stainless steel or hardened metal?

Yes – the high‑speed steel construction (with proper hardness) handles stainless steel up to 1/8" thickness, mild steel, copper, brass, and aluminum. For hard metals, we recommend using cutting fluid or oil to prolong bit life and maintain a clean cut. Avoid excessive pressure; let the bit do the work.

🔧 Will the hex shank fit my impact driver / right‑angle drill?

Absolutely. The 1/4" hex shank is the standard size for all quick‑change chucks, impact drivers, and even handheld drills with three‑jaw chucks. It provides a slip‑free grip and allows one‑handed bit changes in most modern tools.

🧼 How do I prevent the black coating from wearing off quickly?

The black oxide coating is designed to reduce friction and improve rust resistance; some wear on the cutting edges is normal after heavy use. To extend the life, always drill at moderate speeds (600–2000 RPM depending on material), use lubrication for metals, and clean the bits after use with a dry cloth. Avoid drilling into abrasive materials like concrete or masonry.

📐 What do the numbers “1/16-1/2” mean on the bits?

Those numbers indicate the range of hole diameters that single step bit can drill. For example, the smallest bit (1/16–1/2) creates holes from 1/16" up to 1/2" in 1/64" or 1/32" increments, depending on the step design. You simply advance until the desired diameter reaches the material surface. The separate countersink values (3/4", 5/8", etc.) refer to the largest chamfer diameter that the bit can produce on a pre‑drilled hole.

📦 Does the set come with a case or holder?

Yes – the five-step drills arrive in a sturdy, compact storage case that keeps them organized and protects the cutting edges. Each bit has its own molded slot, so you can easily grab the right size for the job.

🏆 Professional grade – perfect for electricians, mechanics, and makers. Backed by a 30‑day satisfaction guarantee.