8Pcs Screw Extractor Set, Hss Screw Extractor Kit with 3 Twist Drill Bits

• Kit Composition & Exact Size Matching Ranges (5+3 SET): This 8-piece set includes 5 double-ended HSS 4341 screw extractors sized #0, #1, #2, #3, #4. It also comes with 3 matched twist pilot drill bits to create pre-drilled pilot holes prior to extraction, eliminating mismatched sizing issues during fastener removal
• HSS 4341 Quenched Hardened Steel Construction – Structural Rigidity Against Breakage Under Torque Load: Each extractor blank is manufactured from grade HSS 4341 high speed steel with full quenching heat treatment. This material delivers consistent tensile strength to resist bending or snapping when applying reverse torque to seized, rusted, high-tension screws
• Double-End Two-In-One Functional Design – Integrated Drilling Tip + Reverse Spiral Extraction Thread: One tapered cutting end creates centered pilot indentations on flat, rounded or broken screw heads; the opposite end features deep, thickened reverse spiral threads. Counter-clockwise rotation locks the thread into the pre-drilled hole to generate gripping force, pulling stuck fasteners outward without slipping or stripping the remaining screw body
• Two-Step Removal Workflow – Resolve 5 Common Damaged Screw Failure Conditions: Step 1: Use included twist drill bit to bore a precise centered hole into the damaged screw core. Step 2: Insert matching size extractor, spin drill in reverse rotation to back out the fastener. This process works for stripped heads, broken studs, rust-corroded bolts, paint-capped screws, and embedded seized fasteners that standard screwdrivers cannot turn
• Universal Hex Shank & Multi-Industry Application – Compatible With Standard Drill Tools For Home & Professional Use: Hexagonal shank fits all common cordless drills, impact drivers, electric drill drivers with standard 1/4 inch chuck holders. Suitable for automotive engine & body repair, industrial machinery maintenance, small electronics teardown, furniture hardware repair, outdoor fixture fastener replacement, for both professional technicians and amateur DIY users

1. Precise Technical Specifications & Size Parameter Table Base Material of Extractors: HSS 4341 high speed steel with quenching hardening treatment Extractor Structure: Double-ended two-in-one design (drilling tip + reverse spiral extraction thread) Extractor Size & Corresponding Extraction Diameter: #0: 2 mm – 4 mm #1: 3 mm – 5 mm #2: 4 mm – 8 mm #3: 5 mm – 10 mm #4: 6 mm – 12 mm Shank Form: Standard hex shank compatible with electric drill chucks Matching Accessories: 3 dedicated twist drill bits for pre-drilling operation 2. Compatibility Scope of Removable Fasteners Usable Screw Types Stripped cross/flat/hex screw heads, broken short screw studs, rust-corroded outdoor bolts, paint-covered capped screws, over-torqued seized embedded fasteners Incompatible Restriction Not applicable for oversized bolts exceeding 12 mm outer diameter, high-hardness alloy structural bolts that cannot be pre-drilled with standard twist drill bits. Confirm screw outer diameter before selecting corresponding extractor size. 3. Core Function & Quantified Advantages vs Entry-Level Extractors Graded full-size set eliminates size mismatch trouble Many single or partial-size extractor packs only cover narrow screw ranges, requiring multiple separate purchases for different repair jobs. This 5-size series covers 2mm–12mm full common fastener sizes for unified one-set solution. Deep reverse anti-slip thread design prevents extractor slipping Budget extractors feature shallow thread grooves that slip under reverse torque pressure; deep thickened spiral threads increase contact surface friction inside pre-drilled holes for stable gripping force during extraction. HSS 4341 heat treated steel resists breakage during high-load extraction Soft low-carbon steel extractors frequently snap inside stuck screw holes during heavy torque work; quenched high-speed steel maintains structural integrity under sustained turning pressure for repeated heavy-duty use. Integrated dual-end design streamlines repair steps Separate single-function drill and extractor tools require frequent bit swapping; integrated double-ended construction cuts tool change time during continuous repair work. 4. Target Users & Real-World Application Scenarios Professional auto mechanics for removing damaged bolts on car engines, brake assemblies, body panels and chassis components Equipment maintenance technicians for repairing industrial machinery, power tools and mechanical assemblies with corroded fasteners Electronics repair technicians for disassembling laptops, household appliances with stripped tiny mounting screws Hardware hobbyists performing small-scale mechanical modification and fastener repair work