GEARWRENCH 86629 16 Piece Metric Combination Ratcheting Wrench Set (90 Tooth 4 Degree Swing Arc 12 Point Reversible Long Beam Full Polish Chrome) Radius Round Nose Bit Cermet II Ceramic Metallic Tooth Formulation: Cermet II Ceramic Metallic Tooth Formulation: Advanced ceramic and metallic composition provides extreme heat resistance and up to 25X lifespan over abrasive discs 49 kg) Warranty Coverage Manufacturer Full Lifetime Warranty Pro Tip: Use the flush reversing lever to change directions quickly when backing out long studs in confined engine bays without losing hand leverage or needing to pull the box end off the fastener head High Torque Chassis Assembly: Loosening rusted vehicle suspension links and structural frame mounting bolts where extended leverage is required switching to the 90 tooth closed end strictly for rapid indexing preserves internal gear synchronicity