Features:Elasticity:Super elasticity, flexible bending, amazing resilience, immediately bounce back after deformation.Industrial grade:Industrial grade elastic connection rod.Square joint, anti-fall ball spring, square interface, anti-fall card slot.Bidirectional winding: Elastic bundling, winding the central axis of the wire, the central axis of the bidirectional winding wire strong torque.Anti-stripping slot: Wrench interface, anti-stripping slot, concave interface with ball spring clamping slot is safer.Anti-tripping:Sleeve interface, anti-tripping ball spring, connecting sleeve ball spring embedded in the concave card slot to prevent falling off.Specifications:Material:Carbon SteelColor:SilverSize:1/4 elastic interface rod: interface lengthabout6.3mm/0.2inch length :about150mm/5.9inch length3/8 elastic interface rod: interface length about10mm/0.4inch length :about195mm/7.7inch1/2 elastic interface rod: interface length about12.5mm/0.5inch length :about245mm/9.6inchPackage Included:3set x Socket Extension BarNote:1. Due to the light and screen difference, the item& 039;s color may be slightly different from the pictures.2. Please allow 0.5-2 cm differences due to manual measurement.