The Kincrome "Super Impact" Sockets are torque tested to 500nm over 2600+ repetitions before failure, which is 4.5 more Nm than the average standard application of wheel impact socket. That means that this new model offers 4.5x the product life of the "original" Kincrome wheel nut impact socket. The colour coded wheel protection sleeves in this four-piece set provide easy size identification and include a Kincrome Power Ring. Kincrome Impact Sockets and Accessories are manufactured from chrome molybdenum steel (Cr-Mo), hardened and tempered to perform in extreme conditions. Designed to be used with pneumatic and power tools where higher torque and force is required, Kincrome Impact Sockets and Accessories meet and exceed the following international standards - ANSI, DIN 3121 and 3129. When using impact tools the following safety precautions should be taken: Always use protective eyewear DO NOT hold the Socket or Accessory while the tool is in operation DO NOT use damaged or worn Sockets or Accessories DO NOT continue to "hammer" a fastener once it becomes tight DO NOT use standard Sockets or Accessories on impact tools | Kincrome 17mm 1/2" Drive Wheel Nut Socket