GearWrench Extractor Insert Set 86192 1/4 to 3/4 Inch 16 Piece Bolt Biter Kit (Magnetic Bi-Directional Cr-Mo Steel SAE Metric Rounded Nut Removal)

GearWrench 86192 16-Piece Bolt Biter™ SAE & Metric Damaged Fastener Wrench Insert Set

The GearWrench 86192 16-piece Bolt Biter™ SAE and metric wrench insert set extracts stripped, frozen, and rounded hex head fasteners spanning 1/4 inch to 3/4 inch and 7mm to 19mm in confined mechanical clearances. Engineered with an ultra-slim body profile that is 70% thinner than traditional extraction sockets, these specialized inserts slip flush inside standard open-end, 6-point, 12-point, and spline ratcheting wrenches via an integrated high-strength magnetic retention collar. Outfitted with patented bi-directional gripping flutes that both loosen and retighten compromised hardware, tapered self-centering entry throats that seat effortlessly without hammer strikes, and drop-forged Chrome-Molybdenum (Cr-Mo) alloy steel finished in chemical-resistant manganese phosphate, it equips automotive technicians, industrial millwrights, and mobile field mechanics with versatile fastener extraction capability.

Best Used For:

• Confined Engine Bay Fastener Removal: Extracting rusted thermostat housing bolts, stripped exhaust manifold studs, and rounded valve cover hardware in tight clearance envelopes where bulky extraction sockets cannot fit.
• Corroded Automotive Chassis and Brake Servicing: Gripping severely rounded caliper bracket bolts, steering linkages, and rusted suspension hardware without slipping or rounding off edges.
• Re-Tightening Damaged Temporary Hardware: Turning damaged bolts clockwise to securely seat hardware temporarily when immediate replacement fasteners are unavailable.

Key Performance & Safety Features

• Ultra-Slim 70% Thinner Profile: Low-profile design seats directly inside existing ratcheting and combination wrenches to access cramped spaces between chassis rails and firewall bulkheads.
• Patented Bi-Directional Flute Gripping: Dual-direction internal flutes grip damaged fasteners securely in counterclockwise removal and clockwise tightening modes.
• Integrated Magnetic Retention Collar: High-coercivity magnets lock each insert firmly into 6-point, 12-point, and spline wrench box ends to prevent drop-out during high-torque turning.
• Dual SAE and Metric Sizing: Engineered insert geometry delivers precise dual-fit coverage across 1/4" to 3/4" SAE and 7mm to 19mm metric fastener dimensions.
• Tapered Self-Centering Throat: Guided entry slides smoothly over mushroomed and distorted hex heads without requiring hammer strikes to seat the tool.
• Forged Chrome-Molybdenum Steel: High-tensile Cr-Mo alloy core with manganese phosphate coating withstands extreme torque while resisting corrosive automotive chemicals.

What's Included

• (16) GearWrench Bolt Biter™ SAE & Metric Extraction Wrench Inserts:
  • Sizes: 1/4" (7mm), 1/4"+ (8mm), 5/16" (8mm), 5/16"+ (8mm-), 3/8" (10mm), 3/8"+ (10mm+), 7/16" (11mm), 7/16"+ (11mm+), 1/2" (12mm/13mm), 1/2"+ (13mm+), 9/16" (14mm), 9/16"+ (14mm+), 5/8" (15mm/16mm), 5/8"+ (16mm+), 11/16" (17mm), 3/4" (19mm)
• (1) Heavy-Duty Fitted Injection-Molded Storage Carrying Case with Sizing Labels

Technical Specifications

Pro-Tip: For maximum breakaway torque on frozen fasteners in tight clearances, pair the Bolt Biter insert with a zero-degree offset ratcheting box wrench; the flush magnetic seating directs 100% of your turning force into the damaged bolt flats without slippage.