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. Each socket is sleeved and has an insert to prevent damage to alloy wheels and nuts.3pc 1/2Sq Drive Alloy Wheel Ultra-Power Impact Socket Set• 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.• Each socket is sleeved and has an insert to prevent damage to alloy wheels and nuts.• Sizes: 17 19 21mm.• Lifetime guarantee*.• Model No. SX039Model No: SX039:Brand: Premier:Drive: 1/2Sq:Nett Weight: 0.78kg:Sizes: 17PTDSEASX039