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Specification
Brand : Hyamass
BulletPoint1 : 【Professional-Grade Cobalt Steel Step Drill Bit Set】Crafted with M35 HSS-Co alloy containing 5% cobalt, this cobalt step drill bit set outperforms standard drill bits with 300% longer lifespan. The added cobalt enhances heat resistance for sustained drilling in stainless steel/steel/metal without warping
BulletPoint2 : 【9 Precision-Sized Bits in 1 Compact Kit】Replace multiple drill bit sets with our 9-step design (4mm-12mm). Laser-etched size markings ensure accurate hole drilling for electrical conduits, plumbing pipes, and sheet metal work. Ideal drill bit kit for mechanics and DIYers needing countersunk holes
BulletPoint3 : 【Hex Shank + Dual Flutes for Maximum Efficiency】1/4" hex shank prevents slippage in drill chucks, delivering 68% higher torque transmission than round shanks. Double straight flutes accelerate swarf removal during high-speed steel/metal drilling operations
BulletPoint4 : 【Multi-Material Mastery: From Copper to Carbon Steel】Engineered as the ultimate drill bit set for metal, effectively cutting through stainless steel (304/316), aluminum, copper, iron, and brass. Self-starting tip creates burr-free holes in 1mm-5mm thickness materials
BulletPoint5 : 【Industrial Durability Meets Workshop Convenience】Hardened M35 cobalt step drill bit set maintains sharpness through 15,000+ RPM operations. Includes protective storage case - your complete countersunk drill bit kit for garage, auto repair, and metal fabrication
BulletPoint6 : 【3/8"HEX Shank︱1/4" Hex Shank】 Fits into power tools chuck securely and eliminates slip. 7/8" Step Drill: 3/8" Tri-Flat Shank; 1/2" Unibit:1/4" Hex Shank
CuttingAngleString : 118.0 degrees
ExternallyAssignedProductIdentifier1 : 711523363533
ExternallyAssignedProductIdentifier2 : 0711523363533
FinishType : Titanium
GpsrSafetyAttestation : 1
IncludedComponents : Step Drill Bits
ItemName : Hyamass Cobalt Steel Step Drill Bit, M35 Grade 5% Cobalt HSS-Co,9 Size from 4mm to 12mm, Double Straight Flutes and 1/4 Inch Hex Shank,Unibit Step Bit for Hole Drilling in Stainless Steel,Metal,Copper
ItemPackageDimensions_Height : 0.5 inches
ItemPackageDimensions_Length : 5 inches
ItemPackageDimensions_Width : 3 inches
ItemTypeKeyword : step-drill-bits
Manufacturer : Hyamass
Material : Cobalt Steel
ModelNumber : Step Drill Bits
NumberOfFlutes : 2
NumberOfItems : 1
PartNumber : Step Drill Bits
ProductDescription : 1.Product Specifications

Material: M35 High-Speed Steel (HSS-Co) with 5% cobalt alloy
Size Range: 9 progressive steps (4mm to 12mm) for versatile hole drilling
Design: Double straight flutes for efficient chip removal; 1/4" hex shank for universal tool compatibility
Compatibility: Works with standard drills (corded/cordless) and impact drivers
Durability: Heat-resistant cobalt steel for extended tool life
Application: Ideal for stainless steel, metal sheets, copper, and other hard materials

2. Key Selling Points

✅ Premium Cobalt Construction
Crafted with 5% cobalt-enriched M35 HSS, this step drill bit set outperforms standard bits by resisting extreme heat and wear. Perfect for drilling into tough metals like stainless steel without losing sharpness, even after repeated use.
✅ 9-Size Versatility in One Tool
Replace multiple drill bits with a single Unibit! The 9-step design (4mm–12mm) creates precise, clean holes in varying sizes—no more switching tools mid-project. Save time and effort on metal fabrication, plumbing, or DIY repairs.
✅ Smooth, Clog-Free Drilling
Double straight flutes channel debris away instantly, reducing friction and overheating. Whether you’re working on thin copper sheets or thick steel plates, enjoy faster, smoother drilling with minimal effort.
✅ Universal Hex Shank for Secure Grip
The 1/4" hex shank fits tightly into drills and drivers, eliminating slippage. Designed for professionals and DIYers who demand stability and safety during high-speed drilling.
✅ Cost-Effective & Long-Lasting
Built to outlast standard HSS bits, this cobalt steel set resists chipping and deformation. A one-time investment for endless metalworking, automotive, or construction projects.

3. Use Cases & Value for Buyers

Metalworkers & Welders: Drill flawless holes in stainless steel panels or sheet metal for fabrication—no burrs, no rework.
Plumbers & HVAC Pros: Effortlessly create clean openings in copper pipes or aluminum ducts for fittings and vents.
Auto Mechanics: Repair or customize vehicles by drilling precise holes in hardened steel frames or exhaust systems.
DIY Enthusiasts: Tackle home upgrades like installing shelves, brackets, or electrical fixtures in metal surfaces.

Why Choose This Drill Bit Set?

This M35 cobalt step drill bit set merges industrial-grade durability with user-friendly versatility. Its heat-resistant design ensures smooth performance under pressure, while the step-bit structure simplifies hole sizing for pros and hobbyists alike. Whether you’re a contractor battling tough materials or a homeowner tackling weekend projects, this kit delivers speed, precision, and long-term value—no more wasted bits or frustrating snags.

ProductSiteLaunchDate : 2023-12-21T03:27:46.751Z
SkipOffer : 1
SupplierDeclaredDgHzRegulation : not_applicable
SupplierDeclaredHasProductIdentifierExemption : 1
SurfaceRecommendation : Aluminum,Copper,Metal,Plastic, Stainless Steel, Steel
SurfaceRecommendation1 : Iron
SurfaceRecommendation2 : Metal
SurfaceRecommendation3 : Co
SurfaceRecommendation4 : Stainless Steel
UnitCount : 1
UnspscCode : 27111700