Five times stronger than the conventional design and tested to 500Nm. Innovative design features a protective metal colour-coded ring that prevents the socket wall spreading. 6pt Socket is sleeved and has an insert to prevent damage to alloy wheels and nuts.21mm 1/2Sq Drive Alloy Wheel Ultra-power Impact Socket• Five times stronger than the conventional design and tested to 500Nm.• Innovative design features a protective metal colour-coded ring that prevents the socket wall spreading.• 6pt Socket is sleeved and has an insert to prevent damage to alloy wheels and nuts.• Lifetime guarantee*.• Model No. SX03921Model No: SX03921:Brand: Premier:Drive: 1/2Sq:Nett Weight: 0.25kg:Size: 21mm:PTDSEASX03921