Chromium plated caps fitted to some wheel nuts are prone to swelling, making them incompatible with standard whole size sockets. Half sizes allow secure fitment for safe removal. Double ended 80mm impact sockets 1/2"Sq Drive 6-point. Black phosphate finish. Features & Benefits:Chromium plated caps fitted to some wheel nuts are prone to swelling, making them incompatible with standard whole size sockets.Half sizes allow secure fitment for safe removal. Double ended 80mm impact sockets 1/2"Sq Drive 6-point.Sizes: 80mm Sockets; 18.5 x 19.5, 19 x 21, 21 x 21.5, 22 x 22.5mm, 1/2"Sq Drive Extension; 75mm (3").Black phosphate finish.Model No. SX1820 Specifications: Model No SX1820 Brand: Sealey Drive: 1/2"Sq Nett Weight: 0.88kg Sizes: 80mm Sockets; 18.5 x 19.5, 19 x 21, 21 x 21.5, 22 x 22.5mm, 1/2"Sq Drive Extension; 75mm (3").